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ADV601

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Host Interface Pins (Continued)

Name

Pins

I/O

Description

FIFO_STP

FIFO Stop. This condition indicates that the host is far ahead of the ADV601’s

compressed data supply or demand requirements. The state of this pin also appears

in the Interrupt Mask/Status register. Use the interrupt mask to assert a Host inter-

rupt (

HIRQ pin) based on the state of the FIFO_STP pin. This pin operates as

follows:

•

LO No FIFO Stop condition (FIFOSTP bit LO)

•

HI FIFO empty (encode) or full (decode) (FIFOSTP bit HI)

STATS_R

Statistics Ready. This pin indicates the Wavelet Statistics (contents of Sum of

Squares, Sum of Value, MIN Value, MAX Value registers) have been updated and

are ready for the Bin Width calculator to read them from the host or DSP interface.

The frequency of this interrupt will be equal to the field rate. The state of this pin

also appears in the Interrupt Mask/Status register. Use the interrupt mask to assert

a Host interrupt (

HIRQ pin) based on the state of the STATS_R pin. This pin

operates as follows:

•

LO No Statistics Ready condition (STATSR bit LO)

•

HI Statistics Ready for BW calculator (STATSR bit HI)

LCODE

Last Compressed Data (for field). This bit indicates the last compressed data word

for field will be retrieved from the FIFO on the next read from the host bus. The

frequency of this interrupt is similar to the field rate, but varies depending on

compression and host response. The state of this pin also appears in the Interrupt

Mask/Status register. Use the interrupt mask to assert a Host interrupt (

HIRQ pin)

based on the state of the LCODE pin. This pin operates as follows:

•

LO No Last Code condition (LCODE bit LO)

•

HI Last data word for field has been read from FIFO (LCODE bit HI)

HIRQ

Host Interrupt Request. This pin indicates an interrupt request to the Host. The

Interrupt Mask/Status register can select conditions for this interrupt based on any

or all of the following: FIFOSTP, FIFOSRQ, FIFOERR, LCODE, STATR or

CCIR656 unrecoverable error. Note that the polarity of the

HIRQ pin can be

modified using the Mode Control register.

RESET

ADV601 Chip Reset. Asserting this pin returns all registers to reset state. Note that

the ADV601 must be reset at least once after power-up with this active low signal

input. For more information on reset, see the SWR bit description.

Power Supply Pins

Name

Pins

I/O

Description

GND

Ground

VDD

+5 V DC Digital Power

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