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參數(shù)資料
| 型號： | CY7C1485V25-167AXI |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | DRAM |
| 英文描述： | 72-Mbit (2M x 36/4M x 18) Pipelined DCD Sync SRAM |
| 中文描述： | 4M X 18 CACHE SRAM, 3.4 ns, PQFP100 |
| 封裝： | 14 X 20 MM, 1.40 MM HEIGHT, LEAD FREE, PLASTIC, MS-026, TQFP-100 |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 906K |
| 代理商： | CY7C1485V25-167AXI |
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CY7C1484V25
CY7C1485V25
Document #: 38-05286 Rev. *H
Page 12 of 26
The SRAM clock input might not be captured correctly if there
is no way in a design to stop (or slow) the clock during a
SAMPLE/PRELOAD instruction. If this is an issue, it is still
possible to capture all other signals and simply ignore the
value of the CLK captured in the boundary scan register.
After the data is captured, it is possible to shift out the data by
putting the TAP into the Shift-DR state. This places the
boundary scan register between the TDI and TDO balls.
Note that because the PRELOAD part of the command is not
implemented, putting the TAP to the Update-DR state while
performing a SAMPLE/PRELOAD instruction has the same
effect as the Pause-DR command.
BYPASS
When the BYPASS instruction is loaded in the instruction
register and the TAP is placed in a Shift-DR state, the bypass
register is placed between the TDI and TDO balls. The
advantage of the BYPASS instruction is that it shortens the
boundary scan path when multiple devices are connected
together on a board.
Reserved
These instructions are not implemented but are reserved for
future use. Do not use these instructions.
TAP Timing
TAP AC Switching Characteristics
Over the Operating Range
[9, 10]
Parameter
Clock
t
TCYC
t
TF
t
TH
t
TL
Output Times
t
TDOV
t
TDOX
Setup Times
t
TMSS
t
TDIS
t
CS
Hold Times
t
TMSH
t
TDIH
t
CH
Description
Min
Max
Unit
TCK Clock Cycle Time
TCK Clock Frequency
TCK Clock HIGH time
TCK Clock LOW time
50
ns
MHz
ns
ns
20
20
20
TCK Clock LOW to TDO Valid
TCK Clock LOW to TDO Invalid
10
ns
ns
0
TMS Setup to TCK Clock Rise
TDI Setup to TCK Clock Rise
Capture Setup to TCK Rise
5
5
5
ns
ns
TMS hold after TCK Clock Rise
TDI Hold after Clock Rise
Capture Hold after Clock Rise
5
5
5
ns
ns
ns
tTL
Test Clock
(TCK)
1
2
3
4
5
6
Test Mode Select
(TMS)
tTH
Test Data-Out
(TDO)
tCYC
Test Data-In
(TDI)
tTMSH
tTMSS
tTDIH
tTDIS
tTDOX
tTDOV
DON’T CARE
UNDEFINED
Notes
9. t
and t
refer to the setup and hold time requirements of latching data from the boundary scan register.
10.Test conditions are specified using the load in TAP AC Test Conditions. t
R
/t
F
= 1 ns.
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