adsp-21483 Analog Devices, Inc., adsp-21483 Datasheet - Page 16

• Manufacturer Part Number: adsp-21483
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21483/21486/21487/21488/21489
Table 9. Pin Descriptions (Continued)
Name
MLBCLK
MLBDAT
MLBSIG
MLBDO
MLBSO
TDI
TDO
TMS
TCK
TRST
EMU
The following symbols appear in the Type column of
O/D = open drain, and T = three-state, ipd = internal pull-down resistor, ipu = internal pull-up resistor.
The internal pull-up (ipu) and internal pull-down (ipd) resistors are designed to hold the internal path from the pins at the expected logic
levels. To pull-up or pull-down the external pads to the expected logic levels, use external resistors. Internal pull-up/pull-down resistors
cannot be enabled/disabled and the value of these resistors cannot be programmed. The range of an ipu resistor can be between 26k–63kΩ.
The range of an ipd resistor can be between 31k–85kΩ.
In this table, all pins are LVTTL compliant with the exception of the thermal diode pins.
Not all pins are available in the 100-lead LQFP package. For more information, see
3
3
3
1
3
Type
I
I/O/T in 3
pin mode. I
in 5 pin
mode.
I/O/T in 3
pin mode. I
in 5 pin
mode
O/T
O/T
I (ipu)
O/T
I (ipu)
I
I (ipu)
O/T (ipu)
State
During/
After Reset
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
Rev. PrA | Page 16 of 66 | March 2010
Description
Media Local Bus Clock. This clock is generated by the MLB controller that is synchro-
nized to the MOST network and provides the timing for the entire MLB interface at
49.152 MHz at Fs=48 kHz. When the MLB controller is not used, this pin should be
grounded.
Media Local Bus Data. The MLBDAT line is driven by the transmitting MLB device and
is received by all other MLB devices including the MLB controller. The MLBDAT line
carries the actual data. In 5-pin MLB mode, this pin is an input only. When the MLB
controller is not used, this pin should be grounded.
Media Local Bus Signal. This is a multiplexed signal which carries the Channel/Address
generated by the MLB Controller, as well as the Command and RxStatus bytes from
MLB devices. In 5-pin mode, this pin is input only. When the MLB controller is not used,
this pin should be grounded.
Media Local Bus Data Output (in 5 pin mode). This pin is used only in 5-pin MLB mode.
This serves as the output data pin in 5-pin mode. When the MLB controller is not used,
this pin can be left floating.
Media Local Bus Signal Output (in 5 pin mode). This pin is used only in 5-pin MLB
mode. This serves as the output signal pin in 5-pin mode. When the MLB controller is
not used, this pin can be left floating.
Test Data Input (JTAG). Provides serial data for the boundary scan logic.
Test Data Output (JTAG). Serial scan output of the boundary scan path.
Test Mode Select (JTAG). Used to control the test state machine.
Test Clock (JTAG). Provides a clock for JTAG boundary scan. TCK must be asserted
(pulsed low) after power-up or held low for proper operation of the device.
Test Reset (JTAG). Resets the test state machine. TRST must be asserted (pulsed low)
after power-up or held low for proper operation of the processor.
Emulation Status. Must be connected to the ADSP-2148x Analog Devices DSP Tools
product line of JTAG emulators target board connector only.
Table
9: A = asynchronous, I = input, O = output, S = synchronous, A/D = active drive,
Table 2 on Page 3
Preliminary Technical Data
and
Table 52 on Page
59.