Spectrum Brands Quad C6x VME64 - Manual (Page 38)

Monaco Technical Reference Spectrum Signal Processing
VME64 Bus Interface
26 Part Number 500-00191
Revision 2.00
The Host Port Interface (HPI) allows a VME host to access the memory map of any
‘C6X. The board transfers 32-bit VME accesses automatically through the 16-bit Host
Port Interface as two 16-bit words. The interface consists of three read/write, 32-bit
registers that are accessed through the VME A24 slave interface:
•
HPI Address register (HPIA)
•
HPI Control register (HPIC). A ‘C6x can also read and write to its HPI Control
register (HPIC) at address 0188 0000h.
•
HPI Data register (HPID)
VME address bits A[3:2] select which register is being accessed in each node’s HPI
register address space. These bits are mapped to the HCNTRL[1:0] control pins of the
‘C6x. The following table shows how the HPI interface is addressed.
Table 9 HPI Register Addresses
VME address
‘C6x
Register
Node
A
Node
B
Node
C
Node
D Description
HPIC 00 2000h 00 3000h 00 4000h 00 5000h State for reading/setting the Control Register value.
HPIA 00 2004h 00 3004h 00 4004h 00 5004h Used to read/set the HPI address pointer. The HPIA
points into the C6x memory space.
HPID 00 2008h 00 3008h 00 4008h 00 5008h A VME host reads and writes data to this address for
DMA transfers to the HPID register. The HPIA register
automatically increments by 4 bytes as each word is
transferred through the HPID register.
HPID 00 200Ch 00 300Ch 00 400Ch 00 500Ch A VME host reads and writes data to this address for
single cycle transfers to the HPID register. The HPIA is
not incremented for this HPI access mode.
HPID
DMA
Space
01 0000h 01 4000h 01 8000h 01 C0000h VME hosts which increment their target address can use
this address space for DMA transfers to the HPID
register. Up to 4K of 32-bit data can be transferred in this
space. Data written to this space is automatically
transferred to the HPID register, and the HPIA register
automatically increments by 4 bytes as each word is
transferred.