Freescale Semiconductor DSP56366 - Manual (Page 45)

PARALLEL HOST INTERFACE (HDI08)
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
Freescale Semiconductor 2-11
HCS Input GPIO
disconnected
Host Chip Select — When HDI08 is programmed to interface a
nonmultiplexed host bus and the HI function is selected, this signal is the
host chip select (HCS) input. The polarity of the chip select is
programmable, but is configured active-low (HCS) after reset.
HA10 Input Host Address 10 — When HDI08 is programmed to interface a multiplexed
host bus and the HI function is selected, this signal is line 10 of the host
address (HA10) input bus.
PB13 Input, output, or
disconnected
Port B 13 — When the HDI08 is configured as GPIO, this signal is
individually programmed as input, output, or internally disconnected.
The default state after reset for this signal is GPIO disconnected.
This input is 5 V tolerant.
HOREQ/HOR
EQ
Output GPIO
disconnected
Host Request — When HDI08 is programmed to interface a single host
request host bus and the HI function is selected, this signal is the host
request (HOREQ) output. The polarity of the host request is programmable,
but is configured as active-low (HOREQ) following reset. The host request
may be programmed as a driven or open-drain output.
HTRQ/
HTRQ
Output Transmit Host Request — When HDI08 is programmed to interface a
double host request host bus and the HI function is selected, this signal is
the transmit host request (HTRQ) output. The polarity of the host request is
programmable, but is configured as active-low (HTRQ) following reset. The
host request may be programmed as a driven or open-drain output.
PB14 Input, output, or
disconnected
Port B 14 — When the HDI08 is configured as GPIO, this signal is
individually programmed as input, output, or internally disconnected.
The default state after reset for this signal is GPIO disconnected.
This input is 5 V tolerant.
Table 2-9 Host Interface (continued)
Signal Name Type
State during
Reset
Signal Description