Rainbow Electronics DS31256 - Manual (Page 3)

DS31256
3 of 181
9.2.3 Free Queue ......................................................................................................................................... 92
9.2.4 Done Queue ........................................................................................................................................ 97
9.2.5 DMA Channel Configuration RAM .................................................................................................. 102
9.3 T RANSMIT S IDE .......................................................................................................................................... 105
9.3.1 Overview ........................................................................................................................................... 105
9.3.2 Packet Descriptors............................................................................................................................ 114
9.3.3 Pending Queue.................................................................................................................................. 116
9.3.4 Done Queue ...................................................................................................................................... 120
9.3.5 DMA Configuration RAM ................................................................................................................. 125
10. PCI BUS...................................................................................................................................... 130
10.1 G ENERAL D ESCRIPTION OF O PERATION ........................................................................................... 130
10.1.1 PCI Read Cycle................................................................................................................................. 131
10.1.2 PCI Write Cycle ................................................................................................................................ 132
10.1.3 PCI Bus Arbitration .......................................................................................................................... 133
10.1.4 PCI Initiator Abort............................................................................................................................ 133
10.1.5 PCI Target Retry............................................................................................................................... 134
10.1.6 PCI Target Disconnect ..................................................................................................................... 134
10.1.7 PCI Target Abort .............................................................................................................................. 135
10.1.8 PCI Fast Back-to-Back ..................................................................................................................... 136
10.2 PCI C ONFIGURATION R EGISTER D ESCRIPTION ................................................................................ 137
10.2.1 Command Bits (PCMD0).................................................................................................................. 138
10.2.2 Status Bits (PCMD0)......................................................................................................................... 139
10.2.3 Command Bits (PCMD1).................................................................................................................. 143
10.2.4 Status Bits (PCMD1)......................................................................................................................... 144
11. LOCAL BUS .............................................................................................................................. 147
11.1 G ENERAL D ESCRIPTION .................................................................................................................... 147
11.1.1 PCI Bridge Mode .............................................................................................................................. 149
11.1.2 Configuration Mode.......................................................................................................................... 151
11.2 L OCAL B US B RIDGE M ODE C ONTROL R EGISTER D ESCRIPTION ....................................................... 153
11.3 E XAMPLES OF B US T IMING FOR L OCAL B US PCI B RIDGE M ODE O PERATION ................................. 155
12. JTAG........................................................................................................................................... 163
12.1 JTAG D ESCRIPTION .......................................................................................................................... 163
12.2 TAP C ONTROLLER S TATE M ACHINE D ESCRIPTION ......................................................................... 164
12.3 I NSTRUCTION R EGISTER AND I NSTRUCTIONS ................................................................................... 166
12.4 T EST R EGISTERS ............................................................................................................................... 167
13. AC CHARACTERISTICS........................................................................................................ 168
14. MECHANICAL DIMENSIONS .............................................................................................. 176
14.1 256 PBGA P ACKAGE ........................................................................................................................ 176
15. APPLICATIONS ....................................................................................................................... 177
15.1 16 P ORT T1 OR E1 WITH 256 HDLC C HANNEL S UPPORT ................................................................ 178
15.2 D UAL T3 WITH 256 HDLC C HANNEL S UPPORT ............................................................................... 179
15.3 S INGLE T3 WITH 512 HDLC C HANNEL S UPPORT ............................................................................ 180
15.4 S INGLE T3 WITH 672 HDLC C HANNEL S UPPORT ............................................................................ 181