xcr3320 Xilinx Corp., xcr3320 Datasheet - Page 21

• Manufacturer Part Number: xcr3320
• Description: Xcr3320 320 Macrocell Sram Cpld
• Manufacturer: Xilinx Corp.

This product has been discontinued. Please see
XCR3320: 320 Macrocell SRAM CPLD
Slave Serial Mode
Figure 23
tion mode. The configuration data is provided into the
XCR3320’s din input synchronous with the cclk input. After
the XCR3320 has loaded its configuration data, it re-trans-
mits incoming configuration data on dout. When configur-
ing a single device, the frequency of cclk can be up to 10
MHz.
A device in slave serial mode can be used as the lead
device in a daisy-chain. When used in daisy-chained oper-
Figure 23: Slave Serial Configuration Schematic
Figure 24: Slave Serial Configuration Mode Timing Diagram
21
shows the interface for the slave serial configura-
DOUT
CCLK
DIN
PROCESSOR
DOWNLOAD
BIT N – 1
MICRO–
CABLE
OR
t
D
t
S
BIT N
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V
BIT N – 1
CC
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crcerrn
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done
cclk
din
M3
M2
M1
M0
XCR3320
ation, cclk is routed into all slave serial mode devices in
parallel and the frequency is limited to 1 MHz. The dout pin
of the lead device is connected to the din pin of the next
device and so on. In daisy-chained operation, all down-
stream devices use slave serial mode regardless of the
configuration mode of the lead device.
Multiple slave XCR3320s can be loaded with identical con-
figurations simultaneously. This is done by loading the con-
figuration data into the din inputs in parallel.
t
CL
resetn
dout
BIT N + 1
BIT N
V
CC
TO DAISY–CHAINED
DEVICES
t
CH
EXTERNALLY CONTROLLED
IF DESIRED
for details.
DS033 (v1.3) October 9, 2000
BIT N + 1
SP00668
SP00610
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