wms7202 Winbond Electronics Corp America, wms7202 Datasheet - Page 12

• Manufacturer Part Number: wms7202
• Description: 256-tap Dual-channel Non-volatile Digital
• Manufacturer: Winbond Electronics Corp America

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Note: C3-C0 are the command op-code; A3, A2 are the NVMEM address; A1, A0 are the channel address.
This chapter describes the sequences of commands to send to the WMS7202 and how to use the
different features.
Inst
No.
7.7. I
7.8. B
1. Take the chip out of SLEEP mode.
2. Check that the write protect is set correctly if writing to NVMEM.
3. Check that R/B is HIGH before issuing command.
4. Pull the CS pin LOW before sending data to the device.
0 0 0 0 x x x x
1 1 0 0 x x A1 A0
0 1 0 0 x x A1 A0
1 0 1 0 A3 A2 A1 A0
0 0 1 0 A3 A2 A1 A0
1 0 1 1 A3 A2 A1 A0
0 0 1 1 A3 A2 A1 A0
0 1 1 1 x x A1 A0
1 1 1 1 x x A1 A0
1 0 0 0 x x x x
0 0 0 1 x x x x
1 1 0 1 A3 A2 A1 A0
1 0 0 1 x x x x
C3 C2 C1 C0 A3 A2 A1
7.8.1 Sending a Command
NSTRUCTION
ASIC
Instruction Byte
A0
O
PERATION
S
ET
D8
D15 D14 D13 D12 D11 D10 D9 D8
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
TABLE 5 – INSTRUCTION SET
Data Byte 1
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
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x
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x
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x
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x
- 12 -
x
x
x
x
x
x
x
x
x
x
x
x
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
Data Byte 2
No Operation (NOP). Do nothing
Read Tap Register and output
selection MUX register
Write to Tap Register with D7-D0
Read NVMEM pointed to by A3-A0
Program NVMEM pointed to by
A3-A0 with D8-D0
Load Tap Register and output
selection MUX register with the
contents of NVMEM pointed to by
A3-A0
Program NVMEM pointed to by
A3-A0 with the contents of Tap
Register and output selection MUX
register
Up: Increment setting of TR by one
tap
Down: Decrement setting of TR by
one tap
Sleep: Discontinue clock supply to
the logic and memories
Wake Up: Clock supply to the logic
and memories
Byte-erase NVMEM pointed to by
A3-A0
Power On Reset: Software reset
the part to the power up state
WMS7202
Operation