Sun Microsystems STP2002QFP SCSI CHANNEL 3

12

STP2002QFP

Sun Microelectronics

Fast Ethernet, Parallel Port, SCSI (FEPS) - STP2002QFP

SCSI CHANNEL 3

3.1 Introduction

The SCSI channel consists of SCSI DVMA (also referred to as SCSI channel

engine) and FAS366, a “Fast and Wide” SCSI controller core. The SCSI

DVMA provides two 64-byte buffers used to transfer data to/from the

FAS366. The FAS366 supplies a 16-bit SCSI data path and a throughput of

20 MB/sec. All programmed I/O access to the FAS366 is driven by the SCSI

DVMA.

Several programmable registers can be used by the SCSI device driver to

direct the SCSI engine and FAS366 to move blocks of data to/from host

memory or to/from devices on the SCSI bus. Once the transfer is complete,

an interrupt is generated on the SBus to inform the driver that block move-

ment is complete, freeing it to initiate further transfers.

3.2 SCSI DVMA

SCSI DVMA is responsible for data movement between FAS366 and the host

memory. It contains two 64-byte buffers. The purpose for providing these

buffers is to have prefetch capability. With this scheme of prefetch buffers,

one buffer can be used for writing/reading data on SBus, while the other buff-

er can be used for reading/writing data from/to FAS366. For SCSI write op-

eration (reading from host memory and writing to FAS366), a chunk of data

is moved from the host memory and stored in the buffers. When FAS366 is

ready to accept data, this data is written to FAS366. For SCSI read operation

(reading from FAS366 and writing to host memory), data being read from

FAS366 is stored in the buffers. This data is written into host memory at a lat-

er time. The whole idea of providing buffers is to absorb the difference in data

transfer rate, between SBus and SCSI bus.

3.3 FAS366

FAS366 is a Fast and Wide SCSI controller core and is integrated into FEPS

as a hard macro.

The following are some of the features of the FAS366 core:

• Supports ANSI X3T9.2/86-109 (SCSI-2) standard

• Sustained SCSI data transfer rates:

- 10-MHz synchronous (fast SCSI)

Contents

Main STP2002QFP STP2002QFP Fast Ethernet, Parallel Port, SCSI (FEPS) USERS GUIDE OVERVIEW 1 1.1 Introduction 1.4 Technology Information 1.5 Compliance Page Page 1.6 Pin Descriptions The signal pins are grouped by function in the following tables. Table 1: SBus Signals Table 2: SCSI Signals Table 3: Ethernet Signals Table 2: SCSI Signals Table 4: Parallel Port Signals Table 5: JTAG/Miscellaneous Signals Page SBUS ADAPTER 2 2.1 Introduction 2.2 SBus Capabilities 2.2.1 Slave Accesses 2.2.2 Master Accesses 2.3 Theory of Operation 2.3.1 Master Operations 2.3.2 Slave Operation SCSI CHANNEL 3 3.1 Introduction 3.2 SCSI DVMA 3.3 FAS366 3.4 Test Support PARALLEL PORT CHANNEL 4 4.1 Introduction 4.2 Parallel Port FIFO Operation 4.3 Bidirectional Parallel Port Interface 4.3.1 DMA Mode Page Page Page Page STP2002QFP Page Page Page Page 4.3.2 Programmed I/O Mode Page 4.4 Differences from STP2000 (MACIO) Parallel Port 4.5 Test Support ETHERNET CHANNEL 5 5.1 Introduction 5.2 Functional Description 5.2.1 Overview 5.2.2 Functional Blocks Page Page 5.2.3 Clock Domains 5.2.4 Host Memory Data Management 5.2.5 Transmit Data Descriptor Ring 5.2.6 Receive Free Buffer Descriptor Ring 5.2.7 Local Memory Data Management 5.2.8 Transmit FIFO Data Structures 5.2.9 Receive FIFO Data Structures 5.3 Error Conditions and Recovery 5.3.1 Fatal Errors 5.3.2 Non-Fatal Errors Page 5.4 Programmers Reference 5.4.1 Overview 5.4.2 Host Memory Data Structures 5.4.3 Transmit Data Structures nearest burst boundary and execute a full DVMA burst read. Figure 10. Transmit Host Data Structures 5.4.4 Receive Data Structures Programming Restrictions: Free receive data buffers must be 64-byte aligned. Table 12: Receive Data Structures Descriptor Layout: Status Word Table 13: Receive Data Structures: Descriptor Layout: Free Buffer Pointer 5.4.5 Local Memory Data Structures 5.4.6 TxFIFO Data Structures 5.4.7 RxFIFO Data Structures Figure 12. TxFIFO Organization 5.4.8 Other User Accessible Resources less specified otherwise. Figure 13. RxFIFO Organization T 6.1 Introduction 6.2 JTAG Macro 6.2.1 TAP Controller 6.2.2 Instruction Register Page 6.2.3 Instruction Decode Logic 6.2.4 Bypass Register 6.2.5 Internal Register Clocking Logic 6.2.6 JTAG ID Register 6.2.7 Boundary Scan Control Logic 6.2.8 TDO MUX logic 6.3 Special JTAG Instructions 6.3.1 Debug Modes 6.3.2 INTEST 6.3.3 SCSI Test Mode 6.4 Clock Stop Pin 6.5 Test Vectors PROGRAMMING MODEL 7 7.1 Introduction 7.2 Parallel Port Channel Registers 7.2.1 Control/Status Register Table 18: Control/Status Register Address Page Page Page 7.2.2 DMA Address and Next Address Register 7.2.3 Byte Count Register Page 7.2.5 Hardware Conguration Register Table 26: Test Control/Status Register Denition Table 27: Hardware Conguration Register Address 7.2.6 Operation Conguration Register Page Page Page 7.2.7 Parallel Data Register 7.2.8 Transfer Control Register Page Page 7.2.9 Output Register 7.2.10 Input Register 7.2.11 Interrupt Control Register Page 7.3 SCSI Channel Registers 7.3.1 SCSI Control/Status Register D_INT_PEND: Table 43: BURST_SIZE Encoding Table 42: Control/Status Register Denition 7.3.2 SCSI Address Register 7.3.3 SCSI Byte Count Register 7.3.4 SCSI Test Control/Status Register Page Page 7.4 FAS366 (SCSI Controller Core) Registers 7.4.1 FAS366 Transfer Counter Low Register (Read Only) 7.4.2 FAS366 Transfer Count Low Register (Write Only) 7.4.3 FAS366 Transfer Counter High Register (Read Only) 7.4.4 FAS366 Transfer Count High (Write Only) Register 7.4.5 FAS366 FIFO Register 7.4.6 FAS366 Command Register Page 7.4.8 FAS366 Select/Reselect Bus ID Register 7.4.9 FAS366 Interrupt Register 7.4.10 FAS366 Select/Reselect Time-Out Register 7.4.11 FAS366 Sequence Step Register 7.4.12 FAS366 Synchronous Transfer Period Register 7.4.13 FAS366 FIFO Flags Register 7.4.14 FAS366 Synchronous Offset Register 7.4.15 FAS366 Conguration #1 Register 7.4.16 FAS366 Clock Conversion Factor Register 7.4.17 FAS366 Status #2 Register 7.4.18 FAS366 Test Register 7.4.19 FAS366 Conguration #2 Register 7.4.20 FAS366 Conguration #3 Register 7.4.21 FAS366 Recommand Counter Register 7.5 Ethernet Channel Registers 7.5.1 Global Software Reset Register 7.5.2 Global Conguration Register 7.5.3 Global Interrupt Mask Register (RW) 7.5.4 Global Status Register Table 98: Global Status Register Denition 7.5.5 ETX Transmit Pending Command 7.5.6 ETX Conguration Register 7.5.7 ETX Transmit Descriptor Pointer (RW) 7.5.8 ETX Transmit Descriptor Ring Size 7.5.9 ETX Transmit Data Buffer Base Address 7.5.10 ETX Transmit Data Buffer Displacement (RO) 7.5.11 ETX Transmit Data Pointer 7.5.12 ETX TxFIFO Packet Counter 7.5.13 ETX TxFIFO Write Pointer 7.5.14 ETX TxFIFO Shadow Write Pointer 7.5.15 ETX TxFIFO Read Pointer 7.5.16 ETX TxFIFO Shadow Read Pointer 7.5.17 ETX State Machine Register 7.5.18 ETX TxFIFO 7.5.19 ERX Conguration Register 7.5.20 ERX Receive Descriptor Pointer Table 124: ERX Conguration Register Denition Table 125: ERX Receive Descriptor Pointer Register Address 7.5.21 ERX Receive Data Buffer Pointer 7.5.22 ERX RxFIFO Write Pointer Page 7.5.23 ERX RxFIFO Shadow Write Pointer 7.5.24 ERX RxFIFO Read Pointer 7.5.25 ERX RxFIFO Packet Counter 7.5.26 ERX State Machine Register 7.5.27 ERX RxFIFO 7.5.28 XIF Conguration Register Table 141: XIF Conguration Register Denition 7.5.29 TX_MAC Software Reset Command 7.5.30 TX_MAC Conguration Register Table 144: TX_MAC Conguration Register Denition 7.5.31 TX_MAC InterPacketGap1 Register 7.5.32 TX_MAC InterPacketGap2 Register 7.5.33 TX_MAC AttemptLimit Register 7.5.34 TX_MAC SlotTime Register 7.5.35 TX_MAC PA Size Register 7.5.36 TX_MAC PA Pattern Register 7.5.37 TX_MAC SFD Pattern Register 7.5.38 TX_MAC JamSize Register 7.5.39 TX_MAC TxMaxFrameSize Register 7.5.40 TX_MAC TxMinFrameSize Register 7.5.41 TX_MAC PeakAttempts Register 7.5.42 TX_MAC Defer Timer 7.5.43 TX_MAC Normal Collision Counter 7.5.44 TX_MAC First Successful Collision Counter 7.5.45 TX_MAC Excessive Collision Counter 7.5.46 TX_MAC Late Collision Counter 7.5.47 TX_MAC Random Number Seed Register 7.5.48 TX_MAC State Machine Register 7.5.49 RX_MAC Software Reset Command 7.5.50 RX_MAC Conguration Register Table 183: RX_MAC Conguration Register Denition 7.5.51 RX_MAC RxMaxFrameSize Register 7.5.52 RX_MAC RxMinFrameSize Register Page 7.5.54 RX_MAC MAC Address 1 Register 7.5.55 RX_MAC MAC Address 0 Register 7.5.56 RX_MAC Receive Frame Counter 7.5.57 RX_MAC Length Error Counter 7.5.58 RX_MAC Alignment Error Counter 7.5.59 RX_MAC FCS Error Counter 7.5.60 RX_MAC State Machine Register 7.5.61 RX_MAC Rx Code Violation Counter 7.5.62 RX_MAC Hash Table 3 Register 7.5.63 RX_MAC Hash Table 2 Register 7.5.64 RX_MAC Hash Table 1 Register 7.5.65 RX_MAC Hash Table 0 Register 7.5.66 RX_MAC Address Filter 2 Register 7.5.67 RX_MAC Address Filter 1 Register 7.5.68 RX_MAC Address Filter 0 Register 7.5.69 RX_MAC Address Filter Mask Register 7.5.70 MIF Bit-Bang Clock 7.5.71 MIF Bit-Bang Data 7.5.72 MIF Bit-Bang Output Enable 7.5.73 MIF Frame/Output Register 7.5.74 MIF Conguration Register This 15-bit register controls the operation of the MIF. Table 227: MIF Conguration Register Address Table 226: MIF Frame/Output Register Denition 7.5.75 MIF Mask Register Table 228: MIF Conguration Register Denition 7.5.76 MIF Status Register 7.5.77 MIF State Machine Register PIN ASSIGNMENTS 8 8.1 Pin Assignments The Table 235 describes the pin assignments for the 240-pin PQFP FEPS package. Page Page Page Page Page Page Page ERRATA 9 9.1 Description of Errata in FEPS Rev 2.2 9.1.1 SCSI DVMA/Channel Engine (CE) Page Page 9.1.2 FAS366 Core 9.1.3 Ethernet Channel