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HI08
Table 2-10. Host Interface (Continued)
Signal Name
HDS/HDS
Type
Input
State During
Reset 1, 2
Ignored Input
Signal Description
Host Data Strobe— When the HI08 is programmed to interface with a
single-data-strobe host bus and the HI function is selected, this signal is the
Host Data Strobe (HDS) Schmitt-trigger input. The polarity of the data strobe
is programmable, but is configured as active-low (HDS) following reset.
Host Write Data— When the HI08 is programmed to interface with a
HWR/HWR
PB12
Input
Input or
Output
double-data-strobe host bus and the HI function is selected, this signal is the
Host Write Data Strobe (HWR) Schmitt-trigger input. The polarity of the data
strobe is programmable, but is configured as active-low (HWR) following
reset.
Port B 12— When the HI08 is configured as GPIO through the HPCR, this
signal is individually programmed through the HDDR.
HCS
Input
Ignored Input
Host Chip Select— When the HI08 is programmed to interface with a
non-multiplexed 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
PB13
Input
Input or
Output
Host Address 10— When the HI08 is programmed to interface with a
multiplexed host bus and the HI function is selected, this signal is line 10 of
the Host Address bus.
Port B 13— When the HI08 is configured as GPIO through the HPCR, this
signal is individually programmed through the HDDR.
HREQ/HREQ
Output
Ignored Input
Host Request— When the HI08 is programmed to interface with a single host
request host bus and the HI function is selected, this signal is the Host
Request (HREQ) output. The polarity of the host request is programmable,
but is configured as active-low (HREQ) following reset. The host request can
be programmed as a driven or open-drain output.
HTRQ/HTRQ
PB14
Output
Input or
Output
Transmit Host Request— When the HI08 is programmed to interface with 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.
Port B 14— When the HI08 is configured as GPIO through the HPCR, this
signal is individually programmed through the HDDR.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
2-11
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