Specifications

CY14C101PA
CY14B101PA
CY14E101PA
Document Number: 001-54392 Rev. *N Page 18 of 44
RDSN (Serial Number Read) Instruction
The serial number is read using RDSN instruction at SPI frequency upto 40 MHz. A serial number read may be performed in burst
mode to read all the eight bytes at once. After the last byte of serial number is read, the device does not loop back. RDSN instruction
can be issued by shifting the op-code for RDSN in through the SI pin of nvSRAM after CS goes LOW. This is followed by nvSRAM
shifting out the eight bytes of serial number through the SO pin.
FAST_RDSN (Fast Serial Number Read) Instruction
The FAST_RDSN instruction is used to read serial number at SPI frequency above 40 MHz and up to 104 MHz (max). A serial number
read may be performed in burst mode to read all the eight bytes at once. After the last byte of serial number is read, the device does
not loop back. FAST_RDSN instruction can be issued by shifting the op-code for FAST_RDSN in through the SI pin of nvSRAM
followed by dummy byte after CS
goes LOW. This is followed by nvSRAM shifting out the eight bytes of serial number through the SO
pin.
Figure 24. WRSN Instruction
Figure 25. RDSN Instruction
Figure 26. FAST_RDSN Instruction
~
~
CS
SCK
SO
01234 5
6
7
0
765432
1
56 57 58 59 60 61 62 63
LSB
D0D1
D2
D3
D4
D5
D6
D7
SI
Op-Code
11 000010
8-Byte Serial Number
MSB
HI-Z
D7
D6
D5
D4
D3
D2
D1
D0
~
~
Byte - 8
Byte - 1
CS
SCK
SO
01234 5
6
7
SI
Op-Code
11 000010
~
~
LSB
D0D1
D2
D3
D4
D5
D6
D7
8-Byte Serial Number
MSB
D7
D6
D5
D4
D3
D2
D1
D0
Byte - 8
Byte - 1
0
765432
1
56 57 58 59 60 61 62 63
~
~
HI-Z
CS
SCK
SO
01234 5
6
7
SI
Op-Code
11 00100 1
~
~
LSB
D0D1
D2
D3
D4
D5
D6
D7
8-Byte Serial Number
MSB
D7
D6
D5
D4
D3
D2
D1
D0
Byte - 8
Byte - 1
0
765432
1
56 57 58 59 60 61 62 63
~
~
X
X
X
X
X
X
X
X
Dummy Byte
8 9 10 11 12 13
14
15
HI-Z