MT57W1MH18B Micron Semiconductor Products, Inc., MT57W1MH18B Datasheet - Page 24

• Manufacturer Part Number: MT57W1MH18B
• Description: 18Mb Ddrii SRAM, 1.8V Vdd, Hstl, 2-Word Burst,
• Manufacturer: Micron Semiconductor Products, Inc.

Table 17: Identification Register Definitions
Table 18: Scan Register Size
Table 19: Instruction Codes
18Mb: 1.8V V
MT57W1MH18B_H.fm – Rev. H, Pub. 3/03
INSTRUCTION FIELD
REGISTER NAME
INSTRUCTION
REVISION NUMBER
(31:29)
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, DDRIIb2 SRAM
CODE
000
001
010
011
100
101
110
111
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.
00def0wx0t0q0b0s0
ALL DEVICES
00000101100
BIT SIZE
107
000
32
3
1
1
24
DESCRIPTION
Revision number.
def = 010 for 36Mb density
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.
2 MEG
1.8V V
Micron Technology, Inc., reserves the right to change products or specifications without notice.
X
8, 1 MEG
DD
, HSTL, DDRIIb2 SRAM
X
18, 512K
©2003 Micron Technology, Inc.
X
36