20-101-1138 Rabbit Semiconductor, 20-101-1138 Datasheet - Page 97
20-101-1138
Manufacturer Part Number
20-101-1138
Description
RCM4300 RABBITCORE
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-101-1139.pdf
(124 pages)
Specifications of 20-101-1138
Module/board Type
MPU Core Module
Product
Microcontroller Modules
Data Bus Width
8 bit
Core Processor
Rabbit 4000
Clock Speed
58.98 MHz
Interface Type
Ethernet
Flash
2 MBytes
Timers
10 x 8 bit
Operating Supply Voltage
3.3 V
Board Size
72 mm x 47 mm x 21 mm
For Use With/related Products
RCM4300
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
316-1141
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Table A-7 lists the delays in gross memory access time for several values of VDD
The measurements are taken at the 50% points under the following conditions.
• T = -40°C to 85°C, V = VDD
• 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
• T
• T
• T
• T
• T
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.
Rabbit Semiconductor’s Technical Note TN227, Interfacing External I/O with Rabbit
2000/3000 Designs, contains suggestions for interfacing I/O devices to the Rabbit 3000
and Rabbit 4000 microprocessors.
RabbitCore RCM4300 User’s Manual
VDD
(V)
adr
3.3
1.8
CSx
IOCSx
IORD
IOWR
BUFEN
, the clock to address delay
IO
, the clock to memory chip select delay
, the clock to I/O read strobe delay
, the clock to I/O write strobe delay
, the clock to I/O chip select delay
, the clock to I/O buffer enable delay
30 pF 60 pF 90 pF
Clock to Address
18
6
Output Delay
Table A-7. Preliminary Data and Clock Delays
(ns)
24
8
11
33
IO
Data Setup
Time Delay
±10%
(ns)
1
3
0.5 ns setting
setup
no dbl / dbl
2.3 / 2.3
7 / 6.5
and T
Spectrum Spreader Delay
hold
.
Worst-Case
1 ns setting
no dbl / dbl
3 / 4.5
8 / 12
(ns)
2 ns setting
no dbl / dbl
11 / 22
4.5 / 9
IO
.
97
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