Motorola MVME1X7P - Manual (Page 92)

2-2 Computer Group Literature Center Web Site
VMEchip2
2
VMEbus-to-Local-
Bus Interface Programmable VMEbus map decoder
Programmable AM decoder
Programmable local bus snoop enable
Simple VMEbus-to-local-bus address translation
8-bit, 16-bit and 32-bit VMEbus data width
8-bit, 16-bit and 32-bit block transfer
Standard and extended VMEbus addressing
Software-enabled write posting mode
Write post buffer (17 four-bytes in BLT mode, two four-bytes in non-
BLT mode)
An eight four-byte read ahead buffer (BLT mode only)
32-bit Local-Bus-to-
VMEbus DMA
Controller Programmable 16-bit, 32-bit, and 64-bit VMEbus data width
Programmable short, standard, and extended VMEbus addressing
Programmable AM code
Programmable local bus snoop enable
16 four-byte FIFO data buffer
Up to 4 GB of data per DMA request
Automatically adjustment of transfer size to optimize bus utilization
DMA complete interrupt
DMAC command chaining supported by a singly-linked list of DMA
commands
VMEbus DMA controller requester with:
– Software-enabled fair request modes;
– Software-configured release modes:
Release-On-Request (ROR), and
Release-On-End-Of-Data (ROEOD);
– Software-configured BR0-BR3 request levels; and
– Software enabled bus-tenure timer
VMEbus Interrupter Software-configured IRQ1-IRQ7 interrupt request level
8-bit software-programmed status/ID register
Table 2-1. Features of the VMEchip2 ASIC (Continued)
Function Features