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Table A-4 lists the delays in gross memory access time.
Table A-4. Data and Clock Delays VIN ±10%, Temp, -40°C–+85°C (maximum)
Clock to Address Output Delay
VIN
30 pF
3.3 V
6
The measurements are taken at the 50% points under the following conditions.
• T = -40°C to 85°C, V = V
• Internal clock to nonloaded CLK pin delay 1 ns @ 85°C/3.0 V
The clock to address output delays are similar, and apply to the following delays.
• T
, the clock to address delay
adr
• T
, the clock to memory chip select delay
CSx
• T
, the clock to I/O chip select delay
IOCSx
• T
, the clock to I/O read strobe delay
IORD
• T
, the clock to I/O write strobe delay
IOWR
• T
, the clock to I/O buffer enable delay
BUFEN
The data setup time delays are similar for both T
When the spectrum spreader is enabled with the clock doubler, every other clock cycle is
shortened (sometimes lengthened) by a maximum amount given in the table above. The
shortening takes place by shortening the high part of the clock. If the doubler is not
enabled, then every clock is shortened during the low part of the clock period. The maxi-
mum shortening for a pair of clocks combined is shown in the table.
Technical Note TN227, Interfacing External I/O with Rabbit 2000/3000 Designs, con-
tains suggestions for interfacing I/O devices to the Rabbit 3000 microprocessors.
RabbitCore RCM3700 User's Manual
(ns)
60 pF
90 pF
8
11
±10%
DD
Spectrum Spreader Delay
Data Setup
Time Delay
Normal
(ns)
no dbl/dbl
1
3/4.5
and T
.
setup
hold
(ns)
Strong
no dbl/dbl
4.5/9
84
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