ADSP-BF531/ADSP-BF532
Table 9. Pin Descriptions (Continued)
Driver
Pin Name
Serial Ports
RSCLK0
RFS0
Type Function
Type1 Pull-Up/Down Requirement
I/O SPORT0 Receive Serial Clock
I/O SPORT0 Receive Frame Sync
D
C
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
DR0PRI
DR0SEC
TSCLK0
TFS0
I
I
SPORT0 Receive Data Primary
SPORT0 Receive Data Secondary
I/O SPORT0 Transmit Serial Clock
I/O SPORT0 Transmit Frame Sync
D
C
C
C
D
C
DT0PRI
DT0SEC
RSCLK1
RFS1
O
O
SPORT0 Transmit Data Primary
SPORT0 Transmit Data Secondary
I/O SPORT1 Receive Serial Clock
I/O SPORT1 Receive Frame Sync
DR1PRI
DR1SEC
TSCLK1
TFS1
I
I
SPORT1 Receive Data Primary
SPORT1 Receive Data Secondary
I/O SPORT1 Transmit Serial Clock
I/O SPORT1 Transmit Frame Sync
D
C
C
C
DT1PRI
DT1SEC
UART Port
RX
O
O
SPORT1 Transmit Data Primary
SPORT1 Transmit Data Secondary
I
UART Receive
UART Transmit
None
None
TX
O
C
Real-Time Clock
RTXI
I
RTC Crystal Input
Pull LOW when not used
N/A
RTXO
O
RTC Crystal Output
Clock
CLKIN
I
Clock/Crystal Input
Crystal Output
Needs to be at a Level or Clocking
None
XTAL
O
Mode Controls
RESET
I
I
I
Reset
Always Active if Core Power On
Pull LOW when not used
NMI
Nonmaskable Interrupt
Boot Mode Strap
BMODE1–0
Voltage Regulator
VROUT1–0
Supplies
VDDEXT
Pull-up or Pull-down Required
O
External FET Drive
N/A
P
P
P
G
I/O Power Supply
N/A
N/A
N/A
N/A
VDDINT
Core Power Supply
Real-Time Clock Power Supply
External Ground
VDDRTC
GND
1 Refer to Figure 28 on Page 43 to Figure 39 on Page 44.
Rev. D
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Page 19 of 60
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August 2006
ADI [ ADI ]
