ST STM32F412 User Manual

RM0402 Rev 6 289/1163
RM0402 Quad-SPI interface (QUADSPI)
316
Figure 52. QUADSPI block diagram when dual-flash mode is enabled
12.3.2 QUADSPI pins
Table 71 lists the QUADSPI pins, six for interfacing with a single Flash memory, or 10 to 11
for interfacing with two Flash memories (FLASH 1 and FLASH 2) in dual-flash mode.
MS35316V1
SPI FLASH 1
CLK
BK1_IO0/SO
BK1_IO1/SI
BK1_IO2
BK1_IO3
CLK
Q0/SI
Q1/SO
Q2/WP
Q3/HOLD
BK1_nCS
CS
AHB
Registers /
control
Clock
management
FIFO
Shift register
QUADSPI
BK2_IO0/SO
BK2_IO1/SI
BK2_IO2
BK2_IO3
BK2_nCS
SPI FLASH 2
CLK
Q0/SI
Q1/SO
Q2/WP
Q3/HOLD
CS
Table 71. QUADSPI pins
Signal name Signal type Description
CLK Digital output Clock to FLASH 1 and FLASH 2
BK1_IO0/SO Digital input/output
Bidirectional IO in dual/quad modes or serial output
in single mode, for FLASH 1
BK1_IO1/SI Digital input/output
Bidirectional IO in dual/quad modes or serial input
in single mode, for FLASH 1
BK1_IO2 Digital input/output Bidirectional IO in quad mode, for FLASH 1
BK1_IO3 Digital input/output Bidirectional IO in quad mode, for FLASH 1
BK2_IO0/SO Digital input/output
Bidirectional IO in dual/quad modes or serial output
in single mode, for FLASH 2
BK2_IO1/SI Digital input/output
Bidirectional IO in dual/quad modes or serial input
in single mode, for FLASH 2
BK2_IO2 Digital input/output Bidirectional IO in quad mode, for FLASH 2
BK2_IO3 Digital input/output Bidirectional IO in quad mode, for FLASH 2
BK1_nCS Digital output
Chip select (active low) for FLASH 1. Can also be
used for FLASH 2 if QUADSPI is always used in
dual-flash mode.
BK2_nCS Digital output
Chip select (active low) for FLASH 2. Can also be
used for FLASH 1 if QUADSPI is always used in
dual-flash mode.

ST STM32F412 Specifications

General

Brand	ST
Model	STM32F412
Category	Microcontrollers
Language	English