MT55L1MY18F Micron Semiconductor Products, Inc., MT55L1MY18F Datasheet - Page 28

• Manufacturer Part Number: MT55L1MY18F
• Description: 18Mb ZBT SRAM, 3.3V Vdd, 2.5V or 3.3V I/O; 2.5V Vdd, 2.5V I/O, Flow-Through,
• Manufacturer: Micron Semiconductor Products, Inc.

Table 22: Identification Register Definitions
Table 23: Scan Register Sizes
Table 24: Instruction Codes
18Mb: 1 Meg x 18, 512K x 32/36 Flow-through ZBT SRAM
MT55L1MY18F_16_D.fm – Rev. D, Pub. 2/03
INSTRUCTION FIELD
REGISTER NAME
INSTRUCTION
Revision Number
(31:28)
Device Depth
(27:23)
Device Width
(22:18)
Micron Device ID
(17:12)
Micron JEDEC ID Code
(11:1)
ID Register Presence
Indicator (0)
Instruction
Bypass
ID
Boundary Scan: x18, x32, x36
EXTEST
IDCODE
SAMPLE Z
RESERVED
SAMPLE/PRELOAD
RESERVED
RESERVED
BYPASS
CODE
000
001
010
011
100
101
110
111
BIT CONFIGURATION
DESCRIPTION
Captures I/O ring contents. Places the boundary scan register between TDI and TDO.
Forces all SRAM outputs to High-Z state. 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.
Does not affect SRAM operation. 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.
00000101100
xxxxxx
00111
00110
00011
00100
0000
BIT SIZE
1
32
75
3
1
DESCRIPTION
Reserved for version number.
Defines depth of 1Mb.
Defines depth of 512K.
Defines width of x18 bits.
Defines width of x32 or x 36 bits.
Reserved for future use.
Allows unique identification of SRAM vendor.
Indicates the presence of an ID register.
28
18Mb: 1 MEG x 18, 512K x 32/36
Micron Technology, Inc., reserves the right to change products or specifications without notice.
FLOW-THROUGH ZBT SRAM
©2003 Micron Technology, Inc.