ADSP-TS101S datasheet(18/48 Pages) AD

18 / 48 page

Rev. C

Page 18 of 48

May 2009

ADSP-TS101S

L1DIR

Link1 Direction. (0 = input, 1 = output)

L2DIR

O (pd

Link2 Direction. (0 = input, 1 = output)

At reset this is a strap pin. For more information, see Table 16 on Page 19.

L3DIR

O (pd

Link3 Direction. (0 = input, 1 = output)

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

CONTROLIMP2–1

CONTROLIMP0

I (pu

I (pd

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)

DS2–0

I (pu

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 VSS; epu = external pull-up approximately 10 k

to VDD-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 11. Pin Definitions—Link Ports (Continued)

Signal

Type

Term

Description

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 VSS; epu = external pull-up approximately 10 k

to VDD-IO, nc = not connected; au = always used.

Table 13. Control Impedance Selection

CONTROLIMP2–0

ADC dig_ctrl LINK dig_ctrl

000

001

010

011

reserved

100

101

reserved

110 (default)

111

reserved

Table 14. Drive Strength Selection

DS2–0

Drive Strength

000

Strength 0

001

Strength 1

010

Strength 2

011

Strength 3

100

Strength 4

101

Strength 5

110

Strength 6

111 (default)

Strength 7

ADSP-TS101S Datasheet(PDF) 18 Page - Analog Devices

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