Quad I/O Read Command

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2022-09-15
Revision
2.3 English

The generic FIFO contents for the quad I/O read command are listed in Table: Generic FIFO Contents for Quad I/O Read Command.

Table 24-22:      Generic FIFO Contents for Quad I/O 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 reference clock 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 EB for page read in SPI mode.

12'd0

1'b0

1'b0

1'b0

1'b1

2'b01

1'b0

1'b1

2'b01

1'b0

1'b0

8'hEB

Send first address byte 10 in quad mode.

12'd0

1'b0

1'b0

1'b0

1'b1

2'b01

1'b0

1'b1

2'b11

1'b0

1'b0

8'h10

Send second address byte 20 in quad mode.

12'd0

1'b0

1'b0

1'b0

1'b1

2'b01

1'b0

1'b1

2'b11

1'b0

1'b0

8'h20

Send third address byte 30 in quad mode.

12'd0

1'b0

1'b0

1'b0

1'b1

2'b01

1'b0

1'b1

2'b11

1'b0

1'b0

8'h30

Send dummy cycle.

12'd0

1'b0

1'b0

1'b0

1'b1

2'b01

1'b0

1'b1

2'b11

1'b0

1'b0

8'hA0

Send four dummy cycles.

12'd0

1'b0

1'b0

1'b0

1'b0

2'b01

1'b0

1'b1

2'b11

1'b0

1'b1

8'h04

Read 100 bytes in quad mode.

12'd0

1'b0

1'b0

1'b1

1'b0

2'b01

1'b0

1'b1

2'b11

1'b0

1'b1

8'h64

Stop CS/SCLK, chip select is deasserted (optional).

12'd0

1'b0

1'b0

1'b0

1'b0

2'b01

1'b0

1'b0

2'b11

1'b0

1'b0

8'h00