TMS320VC5416
Fixed-Point Digital Signal Processor
www.ti.com
SPRS095O–MARCH 1999–REVISED JANUARY 2005
3.7.2 HPI Nonmultiplexed Mode
In nonmultiplexed mode, a host with separate address/data buses can access the HPI16 data register
(HPID) via the HD 16-bit bidirectional data bus, and the address register (HPIA) via the 18-bit HA address
bus. The host initiates the access with the strobe signals (HDS1, HDS2, HCS) and controls the direction of
the access with the HR/W signal. The HPI16 can stall host accesses via the HRDY signal. Note that the
HPIC register is not available in nonmultiplexed mode since there are no HCNTL signals available. All
host accesses initiate a DMA read or write access. Figure 3-8 shows a block diagram of the HPI16 in
nonmultiplexed mode. Figure 3-9 shows the HPI memory map.
HOST
HPI16
PPD[15:0]
DATA[15:0]
HPID[15:0]
HINT
DMA
Address[17:0]
HCNTL0
V
CC
HCNTL1
HBIL
HAS
R/W
HR/W
54xx
CPU
Data Strobes
HDS1, HDS2, HCS
HRDY
READY
Figure 3-8. Host-Port Interface — Nonmulltiplexed Mode
28
Functional Overview
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