TMS320UC5409 datasheet(17/74 Pages) TI

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TMS320UC5409

FIXED-POINT DIGITAL SIGNAL PROCESSOR

SPRS101A – APRIL 1999 – REVISED AUGUST 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

enhanced 8-bit host-port interface (HPI8/16) (continued)

0000h

005Fh

Reserved

0060h

007Fh

Scratch-Pad

RAM

0080h

7FFFh

On-Chip RAM

(32K x 16 Bits)

8000h

FFFFh

Reserved

Figure 6. ’UC5409 HPI Memory Map

HPI nonmultiplexed mode

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 16-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 7 shows a block diagram of the HPI16 in

nonmultiplexed mode.

HPID[15:0]

HAS

HDS1, HDS2, HCS

DMA

PPD[15:0]

DATA[15:0]

Address[15:0]

R/W

Data Strobes

READY

HPI16

HRDY

’54xx

CPU

VCC

HCNTL0

HCNTL1

HR/W

HINT

HBIL

HOST

Figure 7. Host-Port Interface — Nonmultiplexed Mode

host access control

Host accesses are controlled by the data strobes (HDS1 and HDS2), along with chip select (HCS), in exactly

the same fashion as documented in the

HPI nonmultiplexed mode section.

host access type

nonmultiplexed mode, only one access type (HPID read/write) is available since the HPIA register is not

needed because of direct address inputs, and since the HCNTL pins are not available for access-type selection.

TMS320UC5409 Datasheet(PDF) 17 Page - Texas Instruments

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