ADSP-TS202S_06 AD [Analog Devices], ADSP-TS202S_06 Datasheet - Page 18

• Manufacturer Part Number: ADSP-TS202S_06
• Description: TigerSHARC Embedded Processor
• Manufacturer: AD [Analog Devices]

ADSP-TS202S
Table 12. Pin Definitions—Impedance Control, Drive Strength Control, and Regulator Enable
Table 13. Impedance Control Selection
Table 14. Drive Strength/Output Impedance Selection
1
2
Signal
CONTROLIMP0
CONTROLIMP1
DS2,
DS1
ENEDREG
I = input; A = asynchronous; O = output; OD = open-drain output; T = three-state; P = power supply; G = ground; pd = internal pull-down
5 k
pull-up 500
= internal pull-up 40 k
Term (termination of unused pins) column symbols: epd = external pull-down approximately 5 k
imately 5 k
CONTROLIMP1-0
00 (recommended)
01
10 (default)
11
DS2–0
Pins
000
001
010
011
100
101 (default)
110
111
CONTROLIMP1 = 0, A/D mode disabled.
CONTROLIMP1 = 1, A/D mode enabled.
Ω
; pu = internal pull-up 5 k
Ω
Ω
to V
on DSP ID = 0; pd_m = internal pull-down 5 k
DD_IO
Drive
Strength
Strength 0 (11.1%)
Strength 1 (23.8%)
Strength 2 (36.5%)
Strength 3 (49.2%)
Strength 4 (61.9%)
Strength 5 (74.6%)
Strength 6 (87.3%)
Strength 7 (100%)
, nc = not connected; na = not applicable (always used); V
Ω
. For more pull-down and pull-up information, see
1
Type
I (pd)
I (pu)
I (pu)
I (pd)
I (pu)
Ω
; pd_0 = internal pull-down 5 k
Driver Mode
Normal
Reserved
A/D Mode
Reserved
Term
na
na
na
V
SS
Output
Impedance
26 Ω
32 Ω
40 Ω
50 Ω
62 Ω
70 Ω
96 Ω
120 Ω
Rev. C | Page 18 of 48 | December 2006
Description
Impedance Control. As shown in
normal driver mode and A/D driver mode. When using normal mode (recommended),
the output drive strength is set relative to maximum drive strength according to
Table
where drive strength is continuously controlled to match a specific line impedance as
shown in
Digital Drive Strength Selection. Selected as shown in
lation, see
not controlled by the DS2–0 pins. The pins that are always at drive strength 7 (100%)
include: CPA, DPA, TDO, EMU, and RST_OUT. The drive strength for the ACK pin is always
x2 drive strength 7 (100%).
Connect the ENEDREG pin to V
DRAM power supply.
14. When using A/D mode, the resistance control operates in the analog mode,
Ω
Ω
2
on DSP bus master; pu_m = internal pull-up 5 k
Table
on DSP ID = 0; pu_0 = internal pull-up 5 k
Output Drive Currents on Page
14.
Electrical Characteristics on Page
DD_IO
SS
= connect directly to V
. Connect the V
Table
13, the CONTROLIMP1–0 pins select between
36. The drive strength for some pins is preset,
Ω
DD_DRAM
to V
Ω
on DSP ID = 0; pu_od_0 = internal
Table
SS
DD_IO
pins to a properly decoupled
; epu = external pull-up approx-
22.
Ω
; V
on DSP bus master; pu_ad
14. For drive strength calcu-
SS
= connect directly to V
SS