ADSP-TS101S_15 Datasheet, PDF (18/48 Pages) Analog Devices – TigerSHARC Embedded Processor

ADSP-TS101S
Table 11. Pin Definitions—Link Ports (Continued)
Signal
Type
Term Description
L1DIR
L2DIR²
L3DIR
O
O (pd³)
O (pd³)
nc
Link1 Direction. (0 = input, 1 = output)
au
Link2 Direction. (0 = input, 1 = output)
At reset this is a strap pin. For more information, see Table 16 on Page 19.
nc
Link3 Direction. (0 = input, 1 = output)
Type column symbols: A = asynchronous; G = ground; I = input; O = output; o/d = open drain output; P = power supply;
pd = internal pull-down approximately 100 k; pu = internal pull-up approximately 100 k; T = three-state
Term (for termination) column symbols: epd = external pull-down approximately 10 k to V_SS; epu = external pull-up approximately 10 k
to V_DD-IO, nc = not connected; au = always used.
1 _{The link port data pins, if connected or floated for extended periods (for example, token slave with no token master), do not require pull-ups or pull-downs as there are no}
reliability issues and the worst-case power consumption for these floating inputs is negligible. Floating in this case means that these inputs are not driven by any source and
that dc-biased terminations are not present.
2 _{The internal pull-down may not be sufficient. A stronger pull-down may be necessary.}
3 _{See Electrical Characteristics on Page 20 for maximum and minimum current consumption for pull-up and pull-down resistances.}
Table 12. Pin Definitions—Impedance and Drive Strength Control
Signal
Type
Term Description
CONTROLIMP2–1¹ I (pu³) au
CONTROLIMP0²
I (pd³)
au
Impedance Control. For ADC (Address/Data/Controls) and LINK (all link port outputs) signals, the
CONTROLIMP2–0 pins control impedance as shown in Table 13. These pins enable or disable
dig_ctrl mode. When dig_ctrl:
0 = Disabled (maximum drive strength)
1 = Enabled (use DS2–0 drive strength selection)
DS2–0¹
I (pu³)
au
Digital Drive Strength Selection. Selected as shown in Table 14. For drive strength calculation, see
Output Drive Currents on Page 32. 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%) are: CPA, DPA, and EMU.
Type column symbols: A = asynchronous; G = ground; I = input; O = output; o/d = open drain output; P = power supply;
pd = internal pull-down approximately 100 k; pu = internal pull-up approximately 100 k; T = three-state
Term (for termination) column symbols: epd = external pull-down approximately 10 k to V_SS; epu = external pull-up approximately 10 k
to V_DD-IO, nc = not connected; au = always used.
1 _{The internal pull-up may not be sufficient. A stronger pull-up may be necessary.}
2 _{The internal pull-down may not be sufficient. A stronger pull-down may be necessary.}
3 _{See Electrical Characteristics on Page 20 for maximum and minimum current consumption for pull-up and pull-down resistances.}
Table 13. Control Impedance Selection
CONTROLIMP2–0
000
001
010
011
100
101
110 (default)
111
ADC dig_ctrl LINK dig_ctrl
0
0
0
0
0
1
reserved reserved
1
0
reserved reserved
1
1
reserved reserved
Table 14. Drive Strength Selection
DS2–0
000
001
010
011
100
101
110
111 (default)
Drive Strength
Strength 0
Strength 1
Strength 2
Strength 3
Strength 4
Strength 5
Strength 6
Strength 7
Rev. C | Page 18 of 48 | May 2009