DSP56303 datasheet(103/292 Pages) FREESCALE

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Host Port Signals

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

6-3

6.2 Host Port Signals

The host port signals are discussed in Chapter 2, Signals/Connections. Each host port signal can

be programmed as a host port signal or as a GPIO signal, PB[0–15]. See Table 6-1 through

Table 6-3.

The HI08 port can operate in multiplexed or non-multiplexed mode. In multiplexed mode

(HPCR[11]:HMUX = 1), the lower eight address signals multiplex with the eight data lines. In

non-multiplexed mode (HPCR[11]:HMUX = 0), the HI08 requires a chip select signal and three

address lines to select one of the eight registers accessible to the host. Eight lines are used for

data. The HI08 port can also be programmed to use a single or dual read/write data strobe and

single or double host request.

Software and hardware resets clear all DSP-side control registers and configure the HI08 as

GPIO. To select GPIO functions, clear HPCR bits 6 through 1; to select other HI08 functions, set

those same bits. If the HI08 is in GPIO mode, the HDDR configures each corresponding signal in

the HDR as an input signal if the HDDR bit is cleared or as an output signal if the HDDR bit is

set. For details, see Section 6.6.3, Host Data Direction Register (HDDR), on page 6-14 and

Section 6.6.4, Host Data Register (HDR), on page 6-15.

Table 6-1. HI08 Signal Definitions for Operational Modes

HI08 Port Signal

Multiplexed Address/Data Bus Mode

Non-multiplexed Bus Mode

GPIO Mode

HAD[0–7]

H[0–7]

PB[0–7]

HAS/HA0

HAS/HAS

HA0

PB8

HA8/HA1

HA8

HA1

PB9

HA9/HA2

HA9

HA2

PB10

HCS/HA10

HA10

HCS/HCS

PB13

Table 6-2. HI08 Data Strobe Signals

HI08 Port Signal

Single Strobe Mode

Dual Strobe Mode

GPIO Mode

HRW/HRD

HRW

HRD/HRD

PB11

HDS/HWR

HDS/HDS

HWR/HWR

PB12

Table 6-3. HI08 Host Request Signals

HI08 Port Signal

Single Host Request Mode

Double Host Request Mode

GPIO Mode

HREQ/

HTRQ

HREQ/HREQ

HTRQ/HTRQ

PB14

HACK/

HRRQ

HACK/HACK

HRRQ/HRRQ

PB15

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