6.4216
IDT71P71204 (2M x 8-Bit), 71P71104 (2M x 9-Bit), 71P71804 (1M x 18-Bit) 71P71604 (512K x 36-Bit)
Advance Information
18 Mb DDR II SRAM Burst of 2 Commercial Temperature Range
IEEE 1149.1 TEST ACCESS PORT AND BOUNDARY SCAN-JTAG
This part contains an IEEE standard 1149.1 Compatible Test Access Port (TAP). The package pads are monitored by the Serial Scan circuitry
when in test mode. This is to support connectivity testing during manufacturing and system diagnostics. In conformance with IEEE 1149.1, the
SRAM contains a TAP controller, Instruction register, Bypass Register and ID register. The TAP controller has a standard 16-state machine that
resets internally upon power-up; therefore, the TRST signal is not required. It is possible to use this device without utilizing the TAP. To disable
the TAP controller without interfacing with normal operation of the SRAM, TCK must be tied to VSS to preclude a mid level input. TMS and TDI
are designed so an undriven input will produce a response identical to the application of a logic 1, and may be left unconnected, but they may
also be tied to VDD through a resistor. TDO should be left unconnected.
JTAG Block Diagram
JTAG Instruction Coding
TAP Controller State Diagram
SRAM
CORE
BYPASS Re
.
Identification Re
.
Instruction Re
.
ControlSi
nal
s
TAP Controller
TDI
TMS
TCK
TDO
6112 drw 18
Test Logic Reset
Run Test Idle Select DR
Capture DR
Pause DR
Exit 2 DR
Update DR
Shift DR
Exit 1 DR
Select IR
Capture IR
Pause IR
Exit 2 IR
Update IR
Shift IR
Exit 1 IR
0
0
0
0
0
0
1
1
1
1
1
1
1
0
6112 drw 17
0
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
NOTE:
1. Places DQs in Hi-Z in order to sample all input data regardless of other
SRAM inputs.
2. TDI is sampled as an input to the first ID register to allow for the serial shift
of the external TDI data.
3. Bypass register is initialized to Vss when BYPASS instruction is invoked.
The Bypass Register also holds serially loaded TDI when exiting the Shift DR
states.
4. SAMPLE instruction does not place output pins in Hi-Z.
5. This instruction is reserved for future use.
