GS8161Z36BGD-250 GSI TECHNOLOGY, GS8161Z36BGD-250 Datasheet - Page 27

• Manufacturer Part Number: GS8161Z36BGD-250
• Manufacturer: GSI TECHNOLOGY

Specifications of GS8161Z36BGD-250

• Density: 18Mb
• Access Time (max): 5.5ns
• Sync/async: Synchronous
• Architecture: SDR
• Clock Freq (max): 181MHz
• Operating Supply Voltage (typ): 2.5/3.3V
• Address Bus: 19b
• Package Type: FBGA
• Operating Temp Range: 0C to 70C
• Number Of Ports: 4
• Supply Current: 235mA
• Operating Supply Voltage (min): 2.3/3V
• Operating Supply Voltage (max): 2.7/3.6V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 165
• Word Size: 36b
• Number Of Words: 512K
• Lead Free Status / Rohs Status: Compliant

JTAG Pin Descriptions
JTAG Port Registers
Overview
The various JTAG registers, refered to as Test Access Port orTAP Registers, are selected (one at a time) via the sequences of 1s
and 0s applied to TMS as TCK is strobed. Each of the TAP Registers is a serial shift register that captures serial input data on the
rising edge of TCK and pushes serial data out on the next falling edge of TCK. When a register is selected, it is placed between the
TDI and TDO pins.
Instruction Register
The Instruction Register holds the instructions that are executed by the TAP controller when it is moved into the Run, Test/Idle, or
the various data register states. Instructions are 3 bits long. The Instruction Register can be loaded when it is placed between the
TDI and TDO pins. The Instruction Register is automatically preloaded with the IDCODE instruction at power-up or whenever the
controller is placed in Test-Logic-Reset state.
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.
Rev: 1.05a 10/2009
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Note:
This device does not have a TRST (TAP Reset) pin. TRST is optional in IEEE 1149.1. The Test-Logic-Reset state is entered while TMS is
held high for five rising edges of TCK. The TAP Controller is also reset automaticly at power-up.
TMS
TDO
TCK
Pin
TDI
Test Mode Select
Test Data Out
Pin Name
Test Data In
Test Clock
I/O
Out
In
In
In
Clocks all TAP events. All inputs are captured on the rising edge of TCK and all outputs propagate
from the falling edge of TCK.
The TMS input is sampled on the rising edge of TCK. This is the command input for the TAP
controller state machine. An undriven TMS input will produce the same result as a logic one input
level.
The TDI input is sampled on the rising edge of TCK. This is the input side of the serial registers
placed between TDI and TDO. The register placed between TDI and TDO is determined by the
state of the TAP Controller state machine and the instruction that is currently loaded in the TAP
Instruction Register (refer to the TAP Controller State Diagram). An undriven TDI pin will produce
the same result as a logic one input level.
Output that is active depending on the state of the TAP state machine. Output changes in
response to the falling edge of TCK. This is the output side of the serial registers placed between
TDI and TDO.
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GS8161Z18B(T/D)/GS8161Z32B(D)/GS8161Z36B(T/D)
Description
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