TSI-8

Hardware Design Guide, Revision 1

8K x 8K Time-Slot Interchanger

November 2, 2005

8

8

Agere Systems Inc.

3.3 Ball Types

This table describes each type of input, output, and I/O ball used on the TSI-8.

The dc switching and other electrical characteristics are specified later in this document.

3.4 Ball Definitions

This section describes the function of each of the device balls. The balls are listed by ball name. Package ball numbers are

listed in Table 3-1 of this document. The static parameters (drive currents, switching thresholds, etc.) for each ball type (in-

put, output, etc.) are described in Table 5-1 through Table 5-4.

Table 3-4. Ball Types

Type Label

Description

I

CMOS input, TTL switching thresholds.

I pd

CMOS input, TTL switching thresholds with internal pull-down resistor.

I pu

CMOS input, TTL switching thresholds with internal pull-up resistor.

O

CMOS output.

O od

Open drain output.

I/O

Bidirectional ball; CMOS input with TTL switching thresholds and CMOS output.

None

Analog inputs for external resistors, capacitors, voltage references, etc.

P

Power and ground.

Table 3-5. Timing Port

Ball Name Type

Name/Description

FSYNC

I

Frame Synchronization. This signal indicates the beginning of a 125 µs frame event (8 kHz). The

FSYNC ball can be programmed as active-low or active-high, but its polarity is the same for all concen-

tration highway interfaces (CHI). FSYNC can be sampled on either the positive or negative edge of

CHICLK. Time-slot numbers and bit offsets for each CHI are assigned relative to the detection of

FSYNC.

CHICLK

I

Clock. This is the master synchronous clock for the transmit and receive concentration highways. The

frequency can be 8.192 MHz or 16.384 MHz. It must be at least as fast as the highest CHI data rate.

CKSPD0

I

Clock Speed. Static control input that should be tied according to the frequency of CHICLK. If CHICLK

CKSPD1

I pd Clock Speed. Reserved, leave disconnected. 20 k

Ω pull-down resistor.

Table 3-6. Transmit and Receive Concentration Highways

Ball Name Type

Name/Description

RXD[31:00] I pd Receive Data [31:00]. Receive concentration highways. These are serial, synchronous data streams

which may be individually programmed to operate at 2.048 Mbits/s, 4.096 Mbits/s, 8.192 Mbits/s, or

16.384 Mbits/s. They carry 32, 64, 128, or 256 time slots (respectively) each occupying eight contiguous

bits. 20 k

Ω pull-down resistor.

TXD[31:00]

I/O Transmit Data [31:00]. Normally these are output concentration highway data streams with data rate

options identical to the RXD inputs. These balls can be configured to operate as bidirectional multiplex

ports such as H.110. Further information can be found in the system design guide. 20 k

Ω resistor