Pin
Type
FLAG 11-0
I/O/A
Flag Pins. Each is configured via control bits as either an input or an output. As an
input, it can be tested as a condition. As an output, it can be used to signal
external peripherals.
____
I/A
Host Bus Request. Must be asserted by a host processor to request control
HBR
of the ADSP-21065L's external bus. When HBR is asserted in a multiprocessing
system, the ADSP-21065L that is bus master will relinquish the bus and assert
HBG. To relinquish the bus, the ADSP-21065L places the address, data, select,
and strobe lines in a high impedance state. HBR has priority over all ADSF-21065L
bus requests (BR 2-1 ) in a multiprocessing system.
____
I/0
Host Bus Grant. Acknowledges an HBRbus request, indicating that the host
HBG
processor may take control of the external bus. HBG is asserted by the ADSP-
21065L until HBR is released. In a Multiprocessing system, HBG is output by the
ADSP-21065L bus master.
___
I/A
Chip Select. Asserted by host processor to select the ADSP-21065L.
CS
REDY
O
Host Bus Acknowledge. The ADSP-21065L de-asserts REDY to add wait states
(O/D)
to an asynchronous access of its internal memory or IOP registers by a host. Open
drain output (O/D) by default can be programmed in ADREDY bit of SYSCON
register to be active drive (A/D). REDY will only be output if the CS and HBR
inputs are asserted.
______
I/A
DMA Request 1 (DMA Channel 9).
DMAR1
______
I/A
DMA Request 2 (DMA Channel 8).
DMAR2
DMA Grant 1 (DMA Channel 9).
______
O/T
DMAG1
DMA Grant 2 (DMA Channel 8).
______
O/T
DMAG2
_____
I/O/S
Multiprocessing Bus Requests. Used by multiprocessing ADSP-21065Ls
BR
to arbitrate for bus master ship. An ADSP-21065L drives its own BRx line
2-1
(corresponding to the value of its ID 2-0 inputs) only and monitors all others. In a
uniprocessor system tie both BRx pin to V DD
ID 1-0
I
Multiprocessing ID. Determines which multiprocessing bus request (BR 1 -BR 2 )
is used by ADSP-21065L. ID = 01 corresponds to BR 1 , ID = 10 corresponds to
BR 2 , etc. ID = 00 in single-processor systems. These lines are a system
configuration selection which should be hardwired or changed only at reset.
Core Priority Access. Asserting its CPA pin allows the core processor of
____
I/O
CPA (O/D)
an ADSP-21065L bus slave to interrupt background DMA transfers and gain
access to the external bus. CPA is an open drain output that is connected to all
ADSP-21065Ls in the system. The CPA pin has an internal 5 k pull-up resistor. If
core access priority is not required in a system, the CPA pin should be left
unconnected.
DTxX
O
Data Transmit (Serial Ports 0, 1; channels A, B). Each DTxX pin has a 50k
internal pull-up resistor.
DRxX
I
Data Receive (Serial Ports 0, 1;channels A, B). Each DRxX pin has a 50 k
internal pull-up resistor.
TCLKx
I/O
Transmit Clock (Serial Porcs 0, 1). Each TCLKx pin has a 50 k internal pull-up
resistor.
RCLKx
I/O
Receive Clock (Serial Ports 0. 1). Each RCLKx pin has a 50 k . internal pull-up
resistor.
Transmit Frame Sync (Serial Ports 0, 1).
TFSx
I/O
RFSx
I/O
Receive Frame Sync (Serial Ports 0, 1).
Integrated Circuit Diagrams
DSP ADSP21065LKS
part number 254191-001
28
PS18/28/35 Troubleshooting Guide
Function
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