The generic FIFO contents for the read command are listed in Table: Generic FIFO Contents for Read Command.
Table 24-21: Generic FIFO Contents for Read Command
|
Description
|
Reserved
|
Poll
|
Stripe
|
Receive
|
Transmit
|
Data Bus Select
|
CS_
Upper
|
CS_
Lower
|
SPI Mode
|
Exponent
|
Data
_xfer
|
Immediate
_Data
|
|
|
31:20
|
19
|
18
|
17
|
16
|
15:14
|
13
|
12
|
11:10
|
9
|
8
|
7:0
|
|
Start driving chip select (CS). Setup time is four QSPI_REF_CLK cycles.
|
12'd0
|
1'b0
|
1'b0
|
1'b0
|
1'b0
|
2'b01
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b0
|
8'h04
|
|
Send opcode 03 for page read. Start driving chip select and clock.
|
12'd0
|
1'b0
|
1'b0
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b0
|
8'h03
|
|
Send first address byte 10.
|
12'd0
|
1'b0
|
1'b0
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b0
|
8'h10
|
|
Send second address byte 20.
|
12'd0
|
1'b0
|
1'b0
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b0
|
8'h20
|
|
Send third address byte 30.
|
12'd0
|
1'b0
|
1'b0
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b0
|
8'h30
|
|
Read 100 bytes.
|
12'd0
|
1'b0
|
1'b0
|
1'b1
|
1'b0
|
2'b01
|
1'b0
|
1'b1
|
2'b01
|
1'b0
|
1'b1
|
8'h64
|
|
Stop CS/SCLK, chip-select is deasserted. CS hold time is three reference clock cycles (optional).
|
12'd0
|
1'b0
|
1'b0
|
1'b0
|
1'b0
|
2'b01
|
1'b0
|
1'b0
|
2'b01
|
1'b0
|
1'b0
|
8'h04
|