MT54V1MH18A Micron Semiconductor Products, Inc., MT54V1MH18A Datasheet - Page 22

• Manufacturer Part Number: MT54V1MH18A
• Description: 18Mb QDR SRAM, 2.5V Vdd, Hstl, 2-Word Burst,
• Manufacturer: Micron Semiconductor Products, Inc.

Table 15: Identification Register Definitions
Table 16: Scan Register Sizes
Table 17: Instruction Codes
18Mb: 2.5V V
MT54V1MH18A_16_F.fm – Rev. F, Pub. 3/03
INSTRUCTION FIELD
REGISTER NAME
INSTRUCTION
REVISION NUMBER (31:28)
DEVICE ID (28:12)
MICRON JEDEC ID CODE
(11:1)
ID Register Presence
Indicator (0)
Instruction
Bypass
ID
Boundary Scan
EXTEST
IDCODE
SAMPLE Z
RESERVED
SAMPLE/
PRELOAD
RESERVED
RESERVED
BYPASS
DD
, HSTL, QDRb2 SRAM
CODE
000
001
010
011
100
101
110
111
00def0wx0t0q0b0s0 def = 010 for 36Mb density
DESCRIPTION
Captures I/O ring contents. Places the boundary scan register between TDI and TDO. This
instruction is not 1149.1-compliant.
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. This
instruction does not implement 1149.1 preload function and is therefore not 1149.1-
compliant.
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.
ALL DEVICES
00000101100
000
1
BIT SIZE
107
32
3
1
DESCRIPTION
Revision number.
def = 001 for 18Mb density
wx = 11 for x36 width
wx = 10 for x18 width
wx = 01 for x8 width
t = 1 for DLL version
t = 0 for non-DLL version
q = 1 for QDR
q = 0 for DDR
b = 1 for 4-word burst
b = 0 for 2-word burst
s = 1 for separate I/O
s = 0 for common I/O
Allows unique identification of SRAM vendor.
Indicates the presence of an ID register.
22
2.5V V
Micron Technology, Inc., reserves the right to change products or specifications without notice.
DD
1 MEG x 18, 512K x 36
, HSTL, QDRb2 SRAM
©2003 Micron Technology, Inc.