Spectrum Brands Quad C6x VME64 - Manual (Page 39)

Spectrum Signal Processing Monaco Technical Reference
VME64 Bus Interface
Part Number 500-00191 27
Revision 2.00
Before a host can transfer data through a node’s HPI, the VME host must set the HWOB
bit of the node’s HPIC register to “1”. This only has to be done once after the Monaco
board is reset. To access an address within a ‘C6x’s memory space, the VME host loads
the address into the HPIA register. Data is then transferred through the HPID register.
•
The HPID at offset “8h” auto-increments four bytes after every cycle, allowing it to
be used for burst DMA data transfers.
•
The HPID at offset “Ch” does not auto-increment, and is therefore intended for
single cycle accesses only.
•
The HPID DMA Space offers a 16K address space to VME hosts which increment
their target address during DMA transfers. This allows them to transfer data in
blocks of 16K 32-bit words to the HPID register used for DMA transfers.
4.4. Master A32/A24/A16 SCV64 Interface
As a VME master, the Monaco board supports A16, A24, or A32 transactions from any
node to the VME64 bus through the SCV64 chip. Any node can program the SCV64’s
DMA Controller for VME Master Accesses, and can directly master the VMEbus. Each
node has its own
VPAGE Register to support the KFC, KSIZE, and upper 12 and
lower 2 address bits to the SCV64. The upper 11 bits extend the 20-bit address space of
the ‘C6x to the full 32-bit address space of the VME bus. Any node can monitor the
status of the /KIPL interrupt lines, BUSERRORs for each node, and KAVEC line by
reading the
VSTATUS Register .
The Monaco board supports Auto-Syscon capabilities allowing it to become the System
Controller board when placed in the leftmost slot of the VME backplane. If it is to be the
System Controller it should typically be booted from a PEM module equipped with a
boot PROM.
Upon reset, the SCV64 is in Bus-Isolation Mode (BI-Mode) which isolates the SCV64
from the VME64 bus. The SCV64 is released from BI-Mode by a write to the SCV64
Location Monitor from any node of the Monaco board.