Cypress CYV15G0404DXB Link Fault Indication Output, Device Configuration and Control Bus Signals

CYV15G0404DXB

Pin Definitions (continued)

CYV15G0404DXB Quad HOTLink II Transceiver

Name

I/O Characteristics

Signal Description

LFIA

LVTTL Output,

Link Fault Indication Output.

LFIx

is an output status indicator signal.

LFIx

is the

LFIB

asynchronous

logical OR of five internal conditions. LFIx is asserted LOW when any of these condi-

LFIC

tions are true:

LFID

■ Received serial data rate outside expected range

■ Analog amplitude below expected levels

■ Transition density lower than expected

■ Receive channel disabled

■

is LOW

ULCx

■ No REFCLKx±.

Device Configuration and Control Bus Signals

WREN

LVTTL input,

Control Write Enable. The

WREN

input writes the values of the DATA[7:0] bus into

asynchronous,

the latch specified by the address location on the ADDR[3:0] bus.[5]

internal pull up

ADDR[3:0]

LVTTL input

Control Addressing Bus. The ADDR[3:0] bus is the input address bus used to

asynchronous,

configure the device. The WREN input writes the values of the DATA[7:0] bus into the

internal pull up

latch specified by the address location on the ADDR[3:0] bus.[5] Table 9 lists the

configuration latches within the device, and the initialization value of the latches upon

the assertion of RESET. Table 10 shows how the latches are mapped in the device.

DATA[7:0]

LVTTL input

Control Data Bus. The DATA[7:0] bus is the input data bus used to configure the

asynchronous,

device. The

WREN

input writes the values of the DATA[7:0] bus into the latch

internal pull up

specified by address location on the ADDR[3:0] bus.[5] Table 9 lists the configuration

latches within the device, and the initialization value of the latches upon the assertion

of RESET. Table 10 shows how the latches are mapped in the device.

Internal Device

Configuration Latches

RFMODE[A..D][1:0]

Internal Latch[6]

Reframe Mode Select.

FRAMCHAR[A..D]

Internal Latch[6]

Framing Character Select.

DECMODE[A..D]

Internal Latch[6]

Receiver Decoder Mode Select.

DECBYP[A..D]

Internal Latch[6]

Receiver Decoder Bypass.

RXCKSEL[A..D]

Internal Latch[6]

Receive Clock Select.

RXRATE[A..D]

Internal Latch[6]

Receive Clock Rate Select.

SDASEL[A..D][1:0]

Internal Latch[6]

Signal Detect Amplitude Select.

ENCBYP[A..D]

Internal Latch[6]

Transmit Encoder Bypass.

TXCKSEL[A..D]

Internal Latch[6]

Transmit Clock Select.

TXRATE[A..D]

Internal Latch[6]

Transmit PLL Clock Rate Select.

RFEN[A..D]

Internal Latch[6]

Reframe Enable.

RXPLLPD[A..D]

Internal Latch[6]

Receive Channel Power Control.

RXBIST[A..D]

Internal Latch[6]

Receive Bist Disabled.

TXBIST[A..D]

Internal Latch[6]

Transmit Bist Disabled.

OE2[A..D]

Internal Latch[6]

Differential Serial Output Driver 2 Enable.

OE1[A..D]

Internal Latch[6]

Differential Serial Output Driver 1 Enable.

PABRST[A..D]

Internal Latch[6]

Transmit Clock Phase Alignment Buffer Reset.

GLEN[11..0]

Internal Latch[6]

Global Latch Enable.

FGLEN[2..0]

Internal Latch[6]

Force Global Latch Enable.

Note

6. See Device Configuration and Control Interface for detailed information on the internal latches.

Document #: 38-02097 Rev. *B Page 11 of 44

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