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ADSP-21362/ADSP-21363/ADSP-21364/ADSP-21365/ADSP-21366
PIN FUNCTION DESCRIPTIONS
The processor’s pin definitions are listed below. Inputs identi-
fied as synchronous (S) must meet timing requirements with
respect to CLKIN (or with respect to TCK for TMS and TDI).
Inputs identified as asynchronous (A) can be asserted asynchro-
nously to CLKIN (or to TCK for TRST). Tie or pull unused
inputs to V DDEXT or GND, except for the following:
DAI_Px, SPICLK, MISO, MOSI, EMU, TMS, TRST, TDI, and
AD15–0. Note : These pins have pull-up resistors.
Table 6. Pin Descriptions
State During and
Pin
AD15–0
Type
I/O/T
(pu)
After Reset
Three-state with
pull-up enabled
Function
Parallel Port Address/Data. The ADSP-2136x parallel port and its corresponding DMA
unit output addresses and data for peripherals on these multiplexed pins. The multiplex
state is determined by the ALE pin. The parallel port can operate in either 8-bit or 16-bit
mode. Each AD pin has a 22.5 kΩ internal pull-up resistor. For details about the AD pin
operation, refer to the ADSP-2136x SHARC Processor Hardware Reference .
For 8-bit mode: ALE is automatically asserted whenever a change occurs in the upper 16
external address bits, ADDR23–8; ALE is used in conjunction with an external latch to
retain the values of the ADDR23–8.
For detailed information on I/O operations and pin multiplexing, refer to the ADSP-2136x
SHARC Processor Hardware Reference .
RD
O
(pu)
Three-state, driven
high 1
Parallel Port Read Enable. RD is asserted low whenever the processor reads 8-bit or 16-
bit data from an external memory device. When AD15–0 are flags, this pin remains
deasserted. RD has a 22.5 kΩ internal pull-up resistor.
WR
O
(pu)
Three-state, driven
high 1
Parallel Port Write Enable. WR is asserted low whenever the processor writes 8-bit or
16-bit data to an external memory device. When AD15–0 are flags, this pin remains
deasserted. WR has a 22.5 kΩ internal pull-up resistor.
ALE
O
(pd)
Three-state, driven
low 1
Parallel Port Address Latch Enable. ALE is asserted whenever the processor drives a
new address on the parallel port address pins. On reset, ALE is active high. However, it
can be reconfigured using software to be active low. When AD15–0 are flags, this pin
remains deasserted. ALE has a 20 kΩ internal pull-down resistor.
FLAG[0]/IRQ0/SPI
I/O
FLAG[0] INPUT
FLAG0/Interrupt Request0/SPI0 Slave Select.
FLG[0]
FLAG[1]/IRQ1/SPI
I/O
FLAG[1] INPUT
FLAG1/Interrupt Request1/SPI1 Slave Select.
FLG[1]
FLAG[2]/IRQ2/SPI
I/O
FLAG[2] INPUT
FLAG2/Interrupt Request 2/SPI2 Slave Select .
FLG[2]
FLAG[3]/TMREXP/
I/O
FLAG[3] INPUT
FLAG3/Timer Expired/SPI3 Slave Select.
SPIFLG[3]
DAI_P20–1
I/O/T
(pu)
Three-state with
programmable
pull-up
Digital Audio Interface Pins . These pins provide the physical interface to the SRU. The
SRU configuration registers define the combination of on-chip peripheral inputs or
outputs connected to the pin and to the pin’s output enable. The configuration registers
of these peripherals then determine the exact behavior of the pin. Any input or output
signal present in the SRU can be routed to any of these pins. The SRU provides the
connection from the serial ports, input data port, precision clock generators and timers,
sample rate converters and SPI to the DAI_P20–1 pins. These pins have internal 22.5 kΩ
pull-up resistors that are enabled on reset. These pull-ups can be disabled using the
DAI_PIN_PULLUP register.
The following symbols appear in the Type column of Table 6 : A = asynchronous, G = ground, I = input, O = output, P = power supply,
S = synchronous, ( A/D ) = active drive, ( O/D ) = open drain, and T = three-state, ( pd ) = pull-down resistor, ( pu ) = pull-up resistor.
Rev. J |
Page 11 of 60 |
July 2013
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