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Document #: 38-06069 Rev. *I
Page 10 of 25
CYD04S72V
CYD09S72V
CYD18S72V
Table 4. Identification Register Definitions
Instruction Field
Value
Description
Revision Number(31:28)
0h
Reserved for version number
Cypress Device(27:12)
C002h
Defines Cypress DIE number for CYD18S72V and
CYD09S72V
C001h
Defines Cypress DIE number for CYD04S72V
Cypress JDEC ID(11:1)
034h
Allows unique identification of FLEx72 family device vendor
ID Register Presence (0)
1
Indicates the presence of an ID register
Table 5. Scan Registers Sizes
Register Name
Bit Size
Instruction
4
Bypass
1
Identification
32
Boundary Scan
n[21]
Table 6. Instruction Identification Codes
Instruction
Code
Description
EXTEST
0000
Captures the Input/Output ring contents. Places the BSR between the TDI and TDO
BYPASS
1111
Places the BYR between TDI and TDO
IDCODE
1011
Loads the IDR with the vendor ID code and places the register between TDI and TDO
HIGHZ
0111
Places BYR between TDI and TDO. Forces all FLEx72 output drivers to a High-Z state
CLAMP
0100
Controls boundary to 1/0. Places BYR between TDI and TDO
SAMPLE/PRELOAD 1000
Captures the input/output ring contents. Places BSR between TDI and TDO
NBSRST
1100
Resets the non-boundary scan logic. Places BYR between TDI and TDO
RESERVED
All other codes Other combinations are reserved. Do not use other than the above
Note:
21. See details in the device BSDL files.
TDO
D2
TDI
TDO
D1
TDI
TDO
D4
TDI
TDO
D3
TDI
TDO
TDI
TDO
D2
TDI
TDO
D1
TDI
TDI
TDO
Figure 3. Scan Chain
18 Mbit
4 Mbit/9 Mbit
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