MSC8101DS Motorola / Freescale Semiconductor, MSC8101DS Datasheet - Page 17

• Manufacturer Part Number: MSC8101DS
• Description: MSC8101 Network Digital Signal Processor
• Manufacturer: Motorola / Freescale Semiconductor

D52
HCS1/HCS1
D53
HRW
HRD/HRD
D54
HDS/HDS
HWR/HWR
D55
HREQ/HREQ
HTRQ/HTRQ
Signal
Table 1-5. PowerPC System Bus, HDI16, and Interrupt Signals (Continued)
Input/Output
Input/Output
Input/Output
Input/Output
Data Flow
Output
Output
Input
Input
Input
Input
Input
Data Bus Bit 52
In write transactions the bus master drives the valid data on this pin. In read
transactions the slave drives the valid data on this pin.
Host Chip Select
When the HDI16 interface is enabled, this is one of the two chip-select pins. The polarity
of this pin is programmable. The HDI16 chip select is a logical OR of HCS1/HCS1 and
HCS2/HCS2 with appropriate polarity.
Data Bus Bit 53
In write transactions the bus master drives the valid data on this pin. In read
transactions the slave drives the valid data on this pin.
Host Read Write Select
When the HDI16 interface is enabled in Single Strobe mode, this is the read/write input
(HRW).
Host Read Strobe
When the HDI16 is programmed to interface with a double data strobe host bus, this pin
is the read data strobe Schmitt trigger input (HRD/HRD). The polarity of the data strobe
is programmable.
Data Bus Bit 54
In write transactions the bus master drives the valid data on this pin. In read
transactions the slave drives the valid data on this pin.
Host Data Strobe
When the HDI16 is programmed to interface with a single data strobe host bus, this pin
is the data strobe Schmitt trigger input (HDS/HDS). The polarity of the data strobe is
programmable.
Host Write Data Strobe
When the HDI16 is programmed to interface with a double data strobe host bus, this pin
is the write data strobe Schmitt trigger input (HWR/HWR). The polarity of the data
strobe is programmable.
Data Bus Bit 55
In write transactions the bus master drives the valid data on this pin. In read
transactions the slave drives the valid data on this pin.
Host Request
When the HDI16 is programmed to interface with a single host request host bus, this pin
is the host request output (HREQ/HREQ). The polarity of the host request is
programmable. The host request may be programmed as a driven or open-drain output.
Transmit Host Request
When the HDI16 is programmed to interface with a double host request host bus, this
pin is the transmit host request output (HTRQ/HTRQ). The signal can be programmed
as driven or open drain. The polarity of the host request is programmable.
MSC8101 Technical Data
3
3
3
3
3
3
3
Description
1-11