CY14C101Q Datasheet, PDF (17/34 Pages) Cypress Semiconductor – 1-Mbit (128 K x 8) Serial (SPI) nvSRAM Data retention: 20 years at 85 °C

CY14C101Q
CY14B101Q, CY14E101Q
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.
Figure 24. RDSN Instruction
CS
SCK
SI
SO
0 1 2 34 5 670 1 23 4 56 7
56 57 58 59 60 61 62 63
Op-Code
1 1 00 0 0 1 1
Byte - 8
Byte - 1
HI-Z
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
MSB
LSB
8-Byte Serial Number
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 25. FAST_RDSN Instruction
CS
SCK
SI
SO
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7
56 57 58 59 60 61 62 63
11
Op-Code
00 1 0 0 1
HI-Z
Dummy Byte
XXXXX XXX
Byte - 8
Byte - 1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
MSB
LSB
8-Byte Serial Number
Document #: 001-54393 Rev. *F
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