ADSP-21362WBBCZ-1A AD [Analog Devices], ADSP-21362WBBCZ-1A Datasheet - Page 12

• Manufacturer Part Number: ADSP-21362WBBCZ-1A
• Description: SHARC Processor
• Manufacturer: AD [Analog Devices]

ADSP-21362/ADSP-21363/ADSP-21364/ADSP-21365/ADSP-21366
PIN FUNCTION DESCRIPTIONS
The ADSP-2136x 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
Table 4. Pin Descriptions
Pin
AD15–0
RD
WR
ALE
FLAG3–0
DAI_P20–1
DDEXT
or GND, except for the following:
Type
I/O/T
(pu)
O
(pu)
O
(pu)
O
(pd)
I/O/A
I/O/T
(pu)
State During and
After Reset
Three-state with
pull-up enabled
Three-state, driven
high
Three-state, driven
high
Three-state, driven
low
Three-state
Three-state with
programmable
pull-up
1
1
1
Rev. A | Page 12 of 52 | December 2006
Description
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. See
Address/Data Modes on Page 15
For 8-bit mode: ALE is automatically asserted whenever a change occurs in the upper
16 external address bits, A23–8; ALE is used in conjunction with an external latch to
retain the values of the A23–8.
For detailed information on I/O operations and pin multiplexing, see the ADSP-2136x
SHARC Processor Hardware Reference.
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.
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.
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 Pins. Each flag pin is configured via control bits as either an input or output. As
an input, it can be tested as a condition. As an output, it can be used to signal external
peripherals. These pins can be used as an SPI interface slave select output during SPI
mastering. These pins are also multiplexed with the IRQx and the TIMEXP signals. For
detailed information on I/O operations and pin multiplexing, see the ADSP-2136x
SHARC Processor Hardware Reference.
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 determines the exact behavior of the pin. Any input
or output signal present in the SRU may be routed to any of these pins. The SRU
provides the connection from the serial ports, input data port, precision clock gener-
ators and timers, sample rate converters and SPI to the DAI_P20–1 pins. These pins
have internal 22.5 kΩ pull-up resistors which are enabled on reset. These pull-ups can
be disabled in the DAI_PIN_PULLUP register.
The following symbols appear in the Type column of
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 resis-
tor, (pu) = pull-up resistor.
• DAI_Px, SPICLK, MISO, MOSI, EMU, TMS, TRST, TDI,
and AD15–0 (NOTE: These pins have pull-up resistors.)
for details of the AD pin operation.
Table
4: