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DETAILED DESCRIPTION

SLK2501

SLLS502C – OCTOBER 2001 – REVISED MARCH 2007

The SLK2501 is designed to support the OC-48/24/12/3. The operating data speed can be configured through

the RSEL0 and RSEL1 pins as indicated in Table 1 .

Table 1. Data Rate Select

SERIAL DATA RATE

RSEL0

RSEL1

PARALLEL LVDS DATA RATE

TXCLK/RXCLK

OC-48: 2.488 Gbps

0

0

622.08 Mbps

622.08 MHz

OC-24: 1.244 Gbps

1

0

311.04 Mbps

311.04 MHz

OC-12: 622 Mbps

0

1

155.52 Mbps

155.52 MHz

OC-3: 155.52 Mbps

1

1

38.88 Mbps

38.88 MHz

The user can also enable the autorate detection circuitry through the AUTO_DETECT pin. The device

automatically detects the OC-N of the data line rate and generates two bits of output to indicate the data rate to

other devices in the system. When using AUTO_DETECT, RSEL0 and RSEL1 need to be set to 00 or be

unconnected.

Table 2. Data Rate Reporting Under Autorate Detection Mode

SERIAL DATA RATE

RATEOUT0

RATEOUT1

PARALLEL LVDS DATA RATE

TXCLK/RXCLK

OC-48: 2.488 Gbps

0

0

622.08 Mbps

622.08 MHz

OC-24: 1.244 Gbps

1

0

311.04 Mbps

311.04 MHz

OC-12: 622 Mbps

0

1

155.52 Mbps

155.52 MHz

OC-3: 155.52 Mbps

1

1

38.88 Mbps

38.88 MHz

The SLK2501 has four operational modes controlled by two configuration pins. These operational modes are

listed in Table 3. When the device is put in a certain mode, unused circuit blocks are powered down to conserve

system power.

While the transceiver mode, transmit only mode, and receive only mode are straightforward, the repeater mode

of operation is shown in Figure 6. The receive serial data is recovered by the extracted clock, and it is then sent

back out on the transmit serial outputs. The data eye is open both vertically and horizontally in this process. In

the repeater mode, the user can select to turn on the RX demux function through RX_MONITOR pin and allow

the parallel data to be presented. This feature enables the repeater device not only to repeat but also to listen in.

Table 3. Operational Modes

MODE

CONFIG0

CONFIG1

DESCRIPTION

1

0

0

Full duplex transceiver mode

2

0

1

Transmit only mode

3

1

0

Receive only mode

4

1

1

Repeater mode

6

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