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AN2647 Datasheet(PDF) 26 Page - STMicroelectronics

Part # AN2647
Description  Using the STR91xFA external memory interface
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2647 Datasheet(HTML) 26 Page - STMicroelectronics

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Interfacing with synchronous memory
AN2647
26/34
SCU_SCR0
8
EMI_ALE_LNGT
1
ALE length=2 tBCLK
7
EMI_ALE_POLR
0
ALE polarity-active low
6
EMI_MULTIPLEXED
0
Multiplexed mode
SCU_GPIOTYPE [5:9]
7:0
Push-pull
0x00
Configure Port 5,6,7,8 and 9 as push-pull
SCU_GPIOOUT7
15:0
Output Function
0x0AAA
Set Port 7 pins P7.5-P7.0 as A[21:16]
SCU_GPIOOUT6
15:0
Output Function
0x0001
P6.0 as GPIO out
SCU_GPIOOUT5
15:0
Output Function
0x0C00
Set P5.5 as CS1
Table 8.
EMI and port register configuration for PSRAM async mode (80 MHZ BCLK)
EMI configuration
register
Register bit
Multiplexed 16-bits asynchronous mode
Bit
Name
Bit value
Function



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