Datasheet

ADSP-TS203S
Rev. D | Page 17 of 48 | May 2012
Table 12. Pin Definitions—Impedance Control, Drive Strength Control, and Regulator Enable
Signal Type Term Description
CONTROLIMP0
CONTROLIMP1
I (pd)
I (pu)
na
na
Impedance Control. As shown in Table 13, the CONTROLIMP1–0 pins select between
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 14. When using A/D mode, the resistance control operates in the analog mode,
where drive strength is continuously controlled to match a specific line impedance as
shown in Table 14.
DS2, 0
DS1
I (pu)
I (pd)
na Digital Drive Strength Selection. Selected as shown in Table 14. For drive strength
calculation, see Output Drive Currents on Page 34. The drive strength for some pins is
preset, 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 ×2 drive strength 7 (100%).
ENEDREG I (pu) V
SS
Connect the ENEDREG pin to V
SS
. Connect the V
DD_DRAM
pins to a properly decoupled
DRAM power supply.
I = input; A = asynchronous; O = output; OD = open-drain output; T = three-state; P = power supply; G = ground; pd = internal pull-down
5k; pu = internal pull-up 5 k; pd_0 = internal pull-down 5 k on processor ID = 0; pu_0 = internal pull-up 5 k on processor ID = 0;
pu_od_0 = internal pull-up 500  on processor ID = 0; pd_m = internal pull-down 5 k on processor bus master; pu_m = internal pull-up
5 k on processor bus master; pu_ad = internal pull-up 40 k. For more pull-down and pull-up information, see Electrical Characteristics
on Page 21.
Term (termination of unused pins) column symbols: epd = external pull-down approximately 5 k to V
SS
; epu = external pull-up
approximately 5 k to V
DD_IO
, nc = not connected; na = not applicable (always used); V
DD_IO
= connect directly to V
DD_IO
; V
SS
= connect
directly to V
SS
Table 13. Impedance Control Selection
CONTROLIMP1-0 Driver Mode
00 (recommended) Normal
01 Reserved
10 (default) A/D Mode
11 Reserved
Table 14. Drive Strength/Output Impedance Selection
DS2–0
Pins
Drive
Strength
1
Output
Impedance
2
000 Strength 0 (11.1%) 26 
001 Strength 1 (23.8%) 32 
010 Strength 2 (36.5%) 40 
011 Strength 3 (49.2%) 50 
100 Strength 4 (61.9%) 62 
101 (default) Strength 5 (74.6%) 70 
110 Strength 6 (87.3%) 96 
111 Strength 7 (100%) 120 
1
CONTROLIMP1 = 0, A/D mode disabled.
2
CONTROLIMP1 = 1, A/D mode enabled.