TNETV2840ENGGU datasheet(36/91 Pages) TI1

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Functional Overview

December 1999 − Revised October 2008

SPRS122F

3.2.2.4

HPI Nonmultiplexed Mode

In nonmultiplexed mode, a host with separate address/data buses can access the HPI16 data register (HPID)

via the 16-bit HD bidirectional data bus, and the address register (HPIA) via the 19-bit HA address bus. The

HA[18] signal is used to make selection between program (shared) memory and data (local) memory access.

Table 3−4 shows the memory selection via HA[18].

Table 3−4. HPI Local/Shared Memory Selection Via HA[18]

HA[18]

Memory Type

Local (data)

Shared (program)

The host initiates the access with the strobe signals (HDS1, HDS2, and 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

initiate a DMA read or write access. Figure 3−12 shows a block diagram of the HPI16 in nonmultiplexed mode.

HOST

HPI-16

Data[15:0]

HD[15:0]

R/W

HR/W

Data strobes

HDS1, HDS2, HCS

HRDY

Ready

HPID[15:0]

DMA

C54x

CPU

Address[n:0]†

HA[n :0]†

† n = 0 to 18

Figure 3−12. Interfacing to the HPI-16 in Non-Multiplexed Mode

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