Cypress CY7C67200 Underflow Flag Bit, Stall Flag Bit, NAK Flag Bit, Length Exception Flag Bit

Page 22

CY7C67200

Host n Endpoint Status Register [R]

•Host 1 Endpoint Status Register 0xC086

•Host 2 Endpoint Status Register 0xC0A6

Figure 21. Host n Endpoint Status Register

Bit #

15

14

 

13

12

11

10

9

 

8

Field

 

 

Reserved

 

Overflow

Underflow

 

Reserved

 

 

 

 

 

Flag

Flag

 

 

 

Read/Write

-

-

 

-

-

R

R

-

 

-

Default

0

0

 

0

0

0

0

0

 

0

 

 

 

 

 

 

 

 

 

 

 

Bit #

7

6

5

4

3

2

1

0

 

Stall

NAK

Length

Reserved

Sequence

Timeout

Error

ACK

Field

Flag

Flag

Exception

 

Status

Flag

Flag

Flag

 

 

Flag

 

 

 

 

 

Read/Write

R

R

R

-

R

R

R

R

Default

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

Register Description

The Host n Endpoint Status register is a read-only register that provides status for the last USB transaction.

Overflow Flag (Bit 11)

The Overflow Flag bit indicates that the received data in the last data transaction exceeded the maximum length specified in the Host n Count Register. The Overflow Flag should be checked in response to a Length Exception signified by the Length Exception Flag set to ‘1’.

1:Overflow condition occurred

0:Overflow condition did not occur

Underflow Flag (Bit 10)

The Underflow Flag bit indicates that the received data in the last data transaction was less then the maximum length specified in the Host n Count register. The Underflow Flag should be checked in response to a Length Exception signified by the Length Exception Flag set to ‘1’.

1:Underflow condition occurred

0:Underflow condition did not occur

Stall Flag (Bit 7)

The Stall Flag bit indicates that the peripheral device replied with a Stall in the last transaction.

1:Device returned Stall

0:Device did not return Stall

NAK Flag (Bit 6)

The NAK Flag bit indicates that the peripheral device replied with a NAK in the last transaction.

1:Device returned NAK

0:Device did not return NAK

Length Exception Flag (Bit 5)

The Length Exception Flag bit indicates the received data in the data stage of the last transaction does not equal the maximum Host Count specified in the Host n Count register. A Length Exception can either mean an overflow or underflow and the Overflow and Underflow flags (bits 11 and 10, respec- tively) should be checked to determine which event occurred.

1:An overflow or underflow condition occurred

0:An overflow or underflow condition did not occur

Sequence Status (Bit 3)

The Sequence Status bit indicates the state of the last received data toggle from the device. Firmware is responsible for monitoring and handling the sequence status. The Sequence bit is only valid if the ACK bit is set to ‘1’. The Sequence bit is set to ‘0’ when an error is detected in the transaction and the Error bit will be set.

1:DATA1

0:DATA0

Timeout Flag (Bit 2)

The Timeout Flag bit indicates if a timeout condition occurred for the last transaction. A timeout condition can occur when a device either takes too long to respond to a USB host request or takes too long to respond with a handshake.

1:Timeout occurred

0:Timeout did not occur

Error Flag (Bit 1)

The Error Flag bit indicates a transaction failed for any reason other than the following: Timeout, receiving a NAK, or receiving a STALL. Overflow and Underflow are not considered errors and do not affect this bit. CRC5 and CRC16 errors will result in an Error flag along with receiving incorrect packet types.

1:Error detected

0:No error detected

Document #: 38-08014 Rev. *G

Page 22 of 78

[+] Feedback

Page 21 Page 23
Image 22
Page 21 Page 23
Contents CY7C67200 EZ-OTG FeaturesTypical Applications CY16Processor Core Functional Overview IntroductionInterface Descriptions USB Interface USB Interface Pins Pin Name Pin NumberOTG Interface Pins Pin Name Pin Number OTG InterfaceHSS Interface Pins Pin Name Pin Number I2C Eeprom Interface Pins Pin Name Pin NumberSPI Interface Pins Pin Name Pin Number Serial Peripheral InterfaceHPI Addressing HPI A10 HPI Interface Pins 1 Pin Name Pin NumberHost Port Interface HPI Charge Pump InterfaceBooster Interface Charge Pump Interface Pins Pin Name Pin NumberCrystal Interface Boot Mode Crystal Pins Pin Name Pin NumberBoot Configuration Interface PinPower Savings Mode Description Power Savings and Reset DescriptionSleep Memory Map Registers Reserved Bank Register 0xC002 R/WBank Register Example Hex Value Binary Value Hardware Revision Register 0xC004 RCPU Speed Register 0xC008 R/W CPU Speed Definition Processor SpeedOTG Wake Enable Bit Host/Device 2 Wake Enable BitHost/Device 1 Wake Enable Bit HSS Wake Enable BitSPI Interrupt Enable Bit Halt Enable BitOTG Interrupt Enable Bit Host/Device 2 Interrupt Enable BitTimer 1 Interrupt Enable Bit Uart Interrupt Enable BitGpio Interrupt Enable Bit Timer 0 Interrupt Enable BitPull-down Enable Bit Port 2A Diagnostic Enable BitPort 1A Diagnostic Enable Bit LS Pull-up Enable BitWDT Enable Bit Timeout Flag BitLock Enable Bit Reset Strobe BitUSB Registers Register Name Address SIE1/SIE2 Timer n Register R/WGeneral USB Registers 0xC08A/0xC0AAUSB Data Line Pull-up and Pull-down Resistors Mode Port n Mode Select BitPort a Resistors Enable Bit Resistors Function Select EnableISO Enable Bit Preamble Enable BitSync Enable Bit Arm Enable BitHost n Count Register R/W Host n Address Register R/WHost 1 Count Register 0xC084 Host 2 Count Register 0xC0A4 Stall Flag Bit Error Flag BitUnderflow Flag Bit NAK Flag BitPID Select Definition ACK Flag BitHost n PID Register W PID SelectHost n Count Result Register R Host n Device Address Register WSOF/EOP Interrupt Enable Bit Vbus Interrupt Enable BitID Interrupt Enable Bit Port a Wake Interrupt Enable BitSOF/EOP Interrupt Flag Bit Vbus Interrupt Flag BitID Interrupt Flag Bit Port a Wake Interrupt Flag BitCount Bits Count field sets the SOF/EOP counter duration Host n SOF/EOP Count Register R/WHost n SOF/EOP Counter Register R USB Device Only Registers Host n Frame Register RUSB Device Only Registers Reserved Register Name Address Device 1/DeviceNAK Interrupt Enable Bit IN/OUT Ignore Enable BitStall Enable Bit Enable BitDevice n Endpoint n Address Register R/W Device n Endpoint n Count Register R/WDevice n Endpoint n Status Register R/W OUT Exception Flag BitError occurred Error did not occur Setup Flag BitTimeout occurred Timeout condition did not occur Exception Flag BitDevice n Endpoint n Count Result Register R/W Device n Endpoint n Count Result RegisterReset Interrupt Enable Bit Device n Interrupt Enable Register R/WSOF/EOP Timeout Interrupt Enable Bit EP7 Interrupt Enable BitEP3 Interrupt Enable Bit EP5 Interrupt Enable Bit EP2 Interrupt Enable BitEP4 Interrupt Enable Bit EP1 Interrupt Enable BitDevice n Address Register W Device n Status Register R/WEP6 Interrupt Flag Bit Reset Interrupt Flag BitEP7 Interrupt Flag Bit EP5 Interrupt Flag BitDevice n Frame Number Register R SOF/EOP Timeout Flag BitSOF/EOP Timeout Interrupt Counter Bits Device n SOF/EOP Count Register WCharge Pump Enable Bit Vbus Pull-up Enable BitReceive Disable Bit Vbus Discharge Enable BitMode Select Definition Gpio Configuration 108 111 Reserved Write Protect Enable BitSAS Enable Bit Vbus Valid Flag BitInterrupt 0 Enable Bit HSS Enable BitSPI Enable Bit Interrupt 0 Polarity Select BitGpio 1 Input Data Register 0xC026 R Gpio 0 Input Data Register 0xC020 RGpio 0 Direction Register 0xC022 R/W HSS Registers Gpio 1 Direction Register 0xC028 R/WHSS Registers Register Name Address Receive Interrupt Enable Bit Xoff Enable BitCTS Enable Bit RTS Polarity Select BitReceive Overflow Flag Bit Packet Mode Select BitTransmit Ready Bit Receive Packet Ready Flag BitTransmit Gap Select Bits HSS Transmit Gap Register 0xC074 R/WHSS Data Register 0xC076 R/W HSS Receive Address Register 0xC078 R/W HSS Receive Counter Register 0xC07A R/WHPI Registers HSS Transmit Address Register 0xC07C R/WHSS Transmit Counter Register 0xC07E R/W HPI Registers Register Name AddressSOF/EOP2 to HPI Enable Bit Vbus to HPI Enable BitID to HPI Enable Bit HPI Breakpoint Register 0x0140 RSOF/EOP1 to CPU Enable Bit SOF/EOP2 to CPU Enable BitSOF/EOP1 to HPI Enable Bit Reset2 to HPI Enable BitData Bits SIEXmsg Register WSIE1msg Register SIE2msg Register HPI Mailbox Register 0xC0C6 R/WID Flag Bit Reset2 Flag BitVbus Flag Bit SOF/EOP2 Flag BitMailbox Out Flag Bit SPI Registers Reset1 Flag BitDone1 Flag Bit SPI Registers Register Name AddressMaster Active Enable Bit 3Wire Enable BitPhase Select Bit Master Enable BitSCK Strobe Bit Byte Mode BitRead Enable Bit Fifo Init BitFifo Error Flag Bit Transmit Interrupt Enable BitTransfer Interrupt Enable Bit Receive Bit Length BitsTransfer Interrupt Flag Bit CRC Mode Definition CRCMode CRC PolynomialTransmit Interrupt Flag Bit Transmit Interrupt Clear BitReceive CRC Bit CRC Enable BitCRC Clear Bit One in CRC BitSPI Transmit Address Register 0xC0D8 R/W SPI Transmit Count Register 0xC0DA R/WUart Registers SPI Receive Address Register 0xC0DC R/WSPI Receive Count Register 0xC0DE R/W Uart Registers Register Name AddressBaud Select Bits Uart Enable BitScale Select Bit Uart Baud Select Definition Baud Rate DIV8 =Transmit Full Bit Uart Data Register 0xC0E4 R/WPin Descriptions Pin DiagramPin Descriptions Name Type GPIO19 General Purpose IO GPIO20 General Purpose IOA1 HPI A1 A0 HPI A0Operating Conditions Booster Power Input 2.7V toAbsolute Maximum Ratings Crystal Requirements XTALIN, XtaloutDC Characteristics AC Timing Characteristics Reset TimingI2C Eeprom Timing Clock TimingParameter Description Min Typical Max Unit HPI Host Port Interface Write Cycle Timing Read Pulse Width Data Access Time, from HPInRD fallingHPI Host Port Interface Read Cycle Timing Read Cycle Time Document # 38-08014 Rev. *GHSS Block Mode Transmit HSS Byte Mode TransmitHSS Byte and Block Mode Receive Hardware CTS/RTS Handshake Hssrts HssctsRegister Summary Register SummaryGPIO31 GPIO30 GPIO29 SE0 SOF/EOP2 Ordering Information Ordering Code Package Type PB-Free Package DiagramOrdering Information Ball 7.00 mm x 7.00 mm x 1.2 mm Fbga BA48Issue Orig. Description of Change Date Document History
Top Page Image Contents