PXD20RM Datasheet, PDF (1259/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

35.7.3 Reading Flash Data into the AHB Buffer
Reading the content from the same address as it was written to provides the following sequence of bytes,
identical to the write case:
01...02...03...04...05...06...07...08
This results in the AHB Buffer filled with:
Table 35-39. Resulting AHB Buffer Content
AHB Buffer Entry
Content
0
64’h01_02_03_04_05_06_07_08
35.7.3.1 Readout of the AHB Buffer via Memory Mapped Read
The AHB Buffer content appears at read access on the AMBA AHB interface at the QuadSPI module
boundary:
(1a): 32 Bit Read Access: <- 0x01_02_03_04
(2a): 32 Bit Read Access: <- 0x05_06_07_08
(1/2): 64 Bit Read Access: <- 0x01_02_03_04_05_06_07_08
35.8 Serial Flash Devices
Currently flash memory devices with serial flash bus are developed by several vendors. Most standard
commands currently have the same instruction code for all vendors, some commands are however unique
for one vendor. The currently supported list of instruction codes and the required instruction code options
are provided in this chapter.
35.8.1 Supported Instruction Codes in Winbond Devices
Table 35-40. Winbond Instruction Codes
Command
Write Enable
Write Disable
Read Status Reg1
Read Status Reg2
Write Status Reg
Page Program
Instructio
n Code
Required Input Data / Parameters
Options
QSPI_ICR[ICO]
Address
[QSPI_SFAR]
Data
[TX Buffer]
06h
04h
05h
size
35h
size
01h
size
02h
size
A23 - A0
S15 - S0
size * (D7 - D0)¹
Output Data
Status / Data
[RX Buffer]
S7 - S0
S15 - S8
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
35-49