RM5231A PMC-Sierra Inc, RM5231A Datasheet - Page 27

• Manufacturer Part Number: RM5231A
• Description: 64-Bit MIPS RISC Microprocessor with 32/64-Bit System Bus
• Manufacturer: PMC-Sierra Inc

Proprietary and Confidential to PMC-Sierra, Inc and for its Customer’s Internal Use
Document ID: PMC-2002174, Issue 2
4
Pin Descriptions
The following is a list of interface, interrupt, and miscellaneous pins available on the RM5231A.
An ‘*’ at the end of the signal name denotes an active low signal.
Table 5 System Interface
ExtRqst*
Release*
RdRdy*
WrRdy*
ValidIn*
ValidOut*
SysAD[31:0]
SysADC[3:0]
SysCmd[8:0]
SysCmdP
Pin Name
Input
Output
Input
Input
Input
Output
Input/Output
Input/Output
Input/Output
Input/Output
Type
External Request
Signals that the system interface is submitting an external request.
Release Interface
Signals that the processor is releasing the system interface to slave
state.
Read Ready
Signals that an external agent can now accept a processor read.
Write Ready
Signals that an external agent can now accept a processor write
request.
Signals that an external agent is now driving a valid address or data on
the SysAD bus and a valid command or data identifier on the SysCmd
bus.
Signals that the processor is now driving a valid address or data on the
SysAD bus and a valid command or data identifier on the SysCmd bus.
System Address/Data bus
A 32-bit address and data bus for communication between the
processor and an external agent.
A 4-bit bus containing parity check bits for the SysAD bus during data
cycles.
A 9-bit bus for command and data identifier transmission between the
processor and an external agent.
Reserved for system Command/Data identifier bus parity
For the RM5231A, unused on input and zero on output.
Valid Input
Valid Output
System Address/Data check bus
System Command/Data identifier bus
RM5231A™ Microprocessor with 32-Bit System Bus Data Sheet
Description
Preliminary
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