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| 型號(hào)： | XCR3320-10TQ144C |
| 文件頁(yè)數(shù)： | 21/43頁(yè) |
| 文件大?。?/td> | 396K |
| 代理商： | XCR3320-10TQ144C |
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DS033 (v1.1) February 10, 2000
Slave Serial Mode
Figure 23
shows the interface for the slave serial configura-
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-
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.
SP00668
MICRO
–
PROCESSOR
OR
DOWNLOAD
CABLE
crcerrn
prgmn
done
cclk
M2
M1
M0
V
CC
dout
TO DAISY
–
CHAINED
DEVICES
din
XCR3320
M3
resetn
EXTERNALLY CONTROLLED
IF DESIRED
V
CC
Figure 23: Slave Serial Configuration Schematic
BIT N
t
D
DIN
CCLK
DOUT
BIT N
t
S
t
H
t
CL
t
CH
SP00610
BIT N
–
1
BIT N + 1
BIT N
–
1
BIT N + 1
Figure 24: Slave Serial Configuration Mode Timing Diagram
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