Analog Devices ADSP-2192

PRELIMINARY

TECHNICAL

DATA

PRELIMINARY

TECHNICAL

DATA

This information applies to a product under development. Its characteristics and specifications are subject to change with-

out notice. Analog Devices assumes no obligation regarding future manufacturing unless otherwise agreed to in writing. 21REV. PrA

For current information contact Analog Devices at (781) 461-3881 ADSP-2192October 2000

USB Endpoint Description Register

The endpoint description register provides the USB core

with information about the endpoint type, direction, and

max packet size. This register is read/write by the MCU

only. This register is defined for endp oints 4-11.

•PS[9:0] MAX Packet Size for endpoint

•LT[1:0] Last transaction indicator bits: 00 = Clear,

01 = ACK, 10 = NAK, or 11 = ERR

•TY[1:0] Endpoint type bits: 00 = DISABLED, 01 =

ISO, 10= Bul k, or 11 = Interrupt

•DR Endpoint direction bit: 1 = IN or 0 = OUT

•TB Toggle bit for endpoint. Reflects the current state

of the DATA toggle bit.

USB Endpoint NAK Counter Register

This register records the number of sequential NAKs that

have occurred on a given endpoint. This re gister is defined

for endpoints 4-11. This register is read/write by the MCU

only.

•N[3:0] NAK counter. Number of sequential NAKs

that have occurred on a given endpoint. When N[3:0]

is equal to the base NAK counter NK[3:0], a

zero-length packet or packet less that maxpacketsize

will be issued.

•ST 1 = Endpoint is stalled

USB Endpoint Stall Policy Register

This register contains NAK count a nd endpoint FIFO error

policy bit. The STALL status bits for endpoints 1-3 are

included as well. This register is read/write by the MCU

only.

•ST[3:1] 1 = Endpoint is stalled. ST[1] ma ps to end-

point 1, ST[2] maps to endpoint 2, etc.

•NK[3:0] Base NAK counter. Determines how many

sequential NAKs are issued before sending zero length

packet on any given endpoint.

•FE FIFO error policy. 1 = When endpoint FIFO is

overrun/underrun, STALL endpoint

USB Endpoint 1 Code Download Base Address

This register contains an 18 bit address which corresponds

to the starting location for DSP code download on

endpoint1. This register is read/write by the MCU only.

USB Endpoint 2 Code Download Base Address

This register contains an 18 bit address which corresponds

to the starting location for DSP code download on

endpoint2. This register is read/write by the MCU only.

USB Endpoint 3 Code Download Base Address

This register contains an 18 bit address which corresponds

to the starting location for DSP code download on

endpoint3. This register is read/write by the MCU only.

USB Endpoint 1 Code Current Write Pointer Offset

This register contains an 18 bit address which corresponds

to the current write pointer offset from the base address reg-

ister for DSP code download on endpoint1. The sum of

this register and the EP1 Code Download Base Address

This register is read by the MCU only and is cleared to

3FFFF (-1) when the Endpoint 1 Code Download Base

Address Register is updated.

USB Endpoint 2 Code Current Write Pointer Offset

This register contains an 18 bit address which corresponds

to the current write pointer offset from the base address reg-

ister for DSP code download on endpoint2. The sum of

this register and the EP2 Code Download Base Address

This register is read by the MCU only and is cleared to

3FFFF (-1) when the Endpoint 2Code Download Base

Address Register is updated.

USB Endpoint 3 Code Current Write Pointer Offset

This register contains an 18 bit address which corresponds

to the current write pointer offset from the base address reg-

ister for DSP code download on endpoint3. The sum of

this register and the EP3 Code Download Base Address

This register is read by the MCU only and is cleared to

3FFFF (-1) when the Endpoint 3Code Download Base

Address Register is updated.

USB SETUP Token Command Register

This register is defined as 8 bytes long and conta ins the data

sent on the USB from the most recent SETUP transaction.

This register is read by the MCU only.

USB SETUP Token Data Register

If the most recent SETUP transaction involves a data OUT

stage, this register i s defined as 8 bytes long and contai ns

the data sent on the USB during the dat a stage. This is also

where the MCU will write data to be sent in response to a

SETUP transaction involving a data IN stage. This register

is read/write by the MCU only.