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參數(shù)資料
| 型號： | GS8152Z72 |
| 廠商： | GSI TECHNOLOGY |
| 英文描述： | 16Mb Pipelined and Flow Through Synchronous NBT SRAM(16M位流水線式和流通型同步NBT靜態(tài)RAM) |
| 中文描述： | 16Mb的流水線和流量，通過同步唑的SRAM（1,600位流水線式和流通型同步唑靜態(tài)內(nèi)存） |
| 文件頁數(shù)： | 28/39頁 |
| 文件大小： | 757K |
| 代理商： | GS8152Z72 |
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Rev: 1.01 11/2000
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
28/39
2000, Giga Semiconductor, Inc.
Preliminary
GS8152Z18/36/72B-225/200/180/166/150/133
Bypass Register
The Bypass Register is a single bit register that can be placed between TDI and TDO. It allows serial test data to be passed through the RAM’s
JTAG Port to another device in the scan chain with as little delay as possible.
Boundary Scan Register
The Boundary Scan Register is a collection of flip flops that can be preset by the logic level found on the RAM’s input or I/O pins. The flip flops are
then daisy chained together so the levels found can be shifted serially out of the JTAG Port’s TDO pin. The Boundary Scan Register also
includes a number of place holder flip flops (always set to a logic 1). The relationship between the device pins and the bits in the Boundary Scan
Register is described in the Scan Order Table following. The Boundary Scan Register, under the control of the TAP Controller, is loaded with the
contents of the RAMs I/O ring when the controller is in Capture-DR state and then is placed between the TDI and TDO pins when the controller is
moved to Shift-DR state. SAMPLE-Z, SAMPLE/PRELOAD and EXTEST instructions can be used to activate the Boundary Scan Register.
JTAG TAP Block Diagram
Identification (ID) Register
The ID Register is a 32-bit register that is loaded with a device and vendor specific 32-bit code when the controller is put in Capture-DR state with
the IDCODE command loaded in the Instruction Register. The code is loaded from a 32-bit on-chip ROM. It describes various attributes of the
RAM as indicated below. The register is then placed between the TDI and TDO pins when the controller is moved into Shift-DR state. Bit 0 in the
register is the LSB and the first to reach TDO when shifting begins.
Instruction Register
ID Code Register
·
31 30 29
Boundary Scan Register
· · ·
· · ·
n
0
1
2
0
1
2
· · ·
0
1
2
· · ·
0
Bypass Register
TDI
TDO
TMS
TCK
Test Access Port (TAP) Controller
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