ST STM32F446 Series User Manual

Quad-SPI interface (QUADSPI) RM0390
326/1328 RM0390 Rev 4
Figure 62. QUADSPI block diagram when dual-flash mode is enabled
12.3.2 QUADSPI pins
Table 81 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.
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Table 81. 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 STM32F446 Series Specifications

General

Brand	ST
Model	STM32F446 Series
Category	Microcontrollers
Language	English