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Table 7. Pin Definitions—External Port DMA/Flyby
Signal
Type
DMAR3–0
I/A
IOWR
O/T
(pu_0)
IORD
O/T
(pu_0)
O/T
IOEN
(pu_0)
I = input; A = asynchronous; O = output; OD = open-drain output; T = three-state; P = power supply; G = ground; pd = internal pull-down
Ω
5 k
; pu = internal pull-up 5 k
Ω
pull-up 500
on DSP ID = 0; pd_m = internal pull-down 5 k
Ω
= internal pull-up 40 k
. For more pull-down and pull-up information, see
Term (termination of unused pins) column symbols: epd = external pull-down approximately 5 k
Ω
imately 5 k
to V
, nc = not connected; na = not applicable (always used); V
DD_IO
Term
Description
epu
DMA Request Pins. Enable external I/O devices to request DMA services from the DSP.
In response to DMARx, the DSP performs DMA transfers according to the DMA
channel's initialization. The DSP ignores DMA requests from uninitialized channels.
nc
I/O Write. When a DSP DMA channel initiates a flyby mode read transaction, the DSP
asserts the IOWR signal during the data cycles. This assertion makes the I/O device
sample the data instead of the TigerSHARC.
nc
I/O Read. When a DSP DMA channel initiates a flyby mode write transaction, the DSP
asserts the IORD signal during the data cycle. This assertion with the IOEN makes the
I/O device drive the data instead of the TigerSHARC.
nc
I/O Device Output Enable. Enables the output buffers of an external I/O device for fly-
by transactions between the device and external memory. Active on flyby
transactions.
Ω
; pd_0 = internal pull-down 5 k
Rev. C | Page 15 of 48 | December 2006
Ω
on DSP ID = 0; pu_0 = internal pull-up 5 k
Ω
on DSP bus master; pu_m = internal pull-up 5 k
Electrical Characteristics on Page
= connect directly to V
DD_IO
ADSP-TS201S
Ω
on DSP ID = 0; pu_od_0 = internal
Ω
on DSP bus master; pu_ad
22.
Ω
to V
; epu = external pull-up approx-
SS
; V
= connect directly to V
DD_IO
SS
SS
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