Chapter 10
240 MIPS R4000 Microprocessor User's Manual
The transmission time for a signal from an external agent composed of
discrete CMOS logic devices can be calculated from the following
equation:
Transmission Time = (TClock period) – (t
DS
for R4000)
– (Maximum External Output Register Clock-to-Q Delay)
– (Maximum External Clock Buffer Delay Mismatch)
– (Maximum Clock Jitter for R4000 Internal Clocks)
– (Maximum Clock Jitter for TClock)
In this clocking methodology, the hold time of data driven from the
processor to an external sampling register is a critical parameter. To
guarantee hold time, the minimum output delay of the processor, t
DM
,
must be greater than the sum of:
minimum hold time for the external sampling register
+ maximum clock jitter for R4000 internal clocks
+ maximum clock jitter for TClock
+ maximum delay mismatch of the external clock buffers
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