MT54W1MH36B Micron Technology, MT54W1MH36B Datasheet - Page 24

• Manufacturer Part Number: MT54W1MH36B
• Description: SRAM 2-WORD BURST
• Manufacturer: Micron Technology

IDENTIFICATION REGISTER DEFINITIONS
SCAN REGISTER SIZES
INSTRUCTION CODES
NOTE:
36Mb: 1.8V V
MT54W2MH18B_A.fm - Rev 9/02
1. Data in output register is not guaranteed if EXTEST instruction is loaded.
2. After performing EXTEST, power-up conditions are required in order to return part to normal operation.
INSTRUCTION FIELD
REVISION NUMBER (31:28)
DEVICE ID (28:12)
MICRON JEDEC ID CODE
(11:1)
ID Register Presence
Indicator (0)
REGISTER NAME
Instruction
Bypass
ID
Boundary Scan
INSTRUCTION
EXTEST
IDCODE
SAMPLE Z
RESERVED
SAMPLE/PRELOAD
RESERVED
RESERVED
BYPASS
DD
1, 2
, HSTL, QDRIIb2 SRAM
00def0Wx0t0q0b0s0 def = 001 for 36Mb density
BIT SIZE (x18)
ALL DEVICES
00000101100
CODE
000
001
010
011
100
101
110
111
000
109
32
1
3
1
4 MEG x 8, 4 MEG x 9, 2 MEG x 18, 1 MEG x 36
DESCRIPTION
Captures I/O ring contents. Places the boundary scan register between
TDI and TDO.
Loads the ID register with the vendor ID code and places the register
between TDI and TDO. This operation does not affect SRAM operations.
Captures I/O ring contents. Places the boundary scan register between
TDI and TDO. Forces all SRAM output drivers to a High-Z state.
Do Not Use: This instruction is reserved for future use.
Captures I/O ring contents. Places the boundary scan register between
TDI and TDO.
Do Not Use: This instruction is reserved for future use.
Do Not Use: This instruction is reserved for future use.
Places the bypass register between TDI and TDO. This operation does
not affect SRAM operations.
DESCRIPTION
Version number.
wx = 11 for x36, 10 for x18, 00 for x9, and 01 for x8
t = 1 for DLL version, 0 for non-DLL version
q = 1 for QDR, 0 for DDR
b = 1 for four-word burst, 0 for two-word burst
s = 1 for separate I/O, 0 for common I/O
Allows unique identification of SRAM vendor.
Indicates the presence of an ID register.
24
1.8V V
Micron Technology, Inc., reserves the right to change products or specifications without notice.
DD
, HSTL, QDRIIb2 SRAM
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