RM7965A-900UI 900 MHz 64-bit Microprocessor Data Sheet
10 Pin Descriptions
The following is a list of control, data, clock, tertiary cache, interrupt, and miscellaneous pins of
the RM7965A.
Table 19 System Interface
Pin Name
ExtRqst*
Type
Description
Input
External request
Signals that the external agent is submitting an external request.
Release interface
Release*
Output
Signals that the processor is releasing the system interface to slave
state
RdRdy*
WrRdy*
Input
Input
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.
ValidIn*
Input
Valid Input
Signals that an external agent is now driving a valid address or data
on the bus and a valid command or data identifier on the SysCmd
bus.
ValidOut*
Output
Valid output
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.
PRqst*
Output
Input
Processor Request
When asserted this signal requests that control of the system
interface be returned to the processor.
PAck*
Processor Acknowledge
When asserted, in response to PRqst*, this signal indicates to the
processor that it has been granted control of the system interface.
RspSwap*
Input
Response Swap
RspSwap* is used by the external agent to signal the processor
when it is about to return a memory reference out of order; i.e., of two
outstanding memory references, the data for the second reference is
being returned ahead of the data for the first reference. In order that
the processor will have time to switch the address to the tertiary
cache, this signal must be asserted a minimum of two cycles prior to
the data itself being presented. Note that this signal works as a
toggle; i.e., for each cycle that it is held asserted the order of return is
reversed. By default, anytime the processor issues a second read it
is assumed that the reads will be returned in order; i.e., no action is
required if the reads are indeed returned in order.
RdType
Output
Read Type
During the address cycle of a read request, RdType indicates
whether the read request is an instruction read or a data read.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2100294, Issue 2
55
PMC [ PMC-SIERRA, INC ]
