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USS820FD Datasheet(PDF) 39 Page - Agere Systems

Part # USS820FD
Description  USB Device Controller
PDF  56 Pages
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Manufacturer  AGERE [Agere Systems]
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USS820FD Datasheet(HTML) 39 Page - Agere Systems

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Agere Systems Inc.
39
Data Sheet, Rev. 1
August 2004
USB Device Controller
USS-820FD
Register Interface (continued)
Table 38. Data Set Available (DSAV)—Address: 1DH; Default: 0000 0000B
This register contains receive/transmit data set available bits.
Table 39. Data Set Available (DSAV1)—Address: 1EH; Default: 0000 0000B
This register contains receive/transmit data set available bits.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RXAV3
TXAV3
RXAV2
TXAV2
RXAV1
TXAV1
RXAV0
TXAV0
R
R
RR
RR
RR
Bit
Symbol
Function/Description
7
RXAV3
Receive/Transmit Data Set Available. This feature is only available if MCSR.FEAT = 1
or TXDSAM = 1; otherwise, reads 0. May be used to improve firmware efficiency when
polling endpoints. For receive FIFOs, this register indicates that one or more data sets
are available to be read. For transmit FIFOs, this register indicates that one or more data
sets are available to be written. Bits always read 0 for endpoints which are not enabled
(RXEPEN/TXEPEN = 0). If a transmit endpoint has TXDSAM = 1, the corresponding
RXAV/TXAV bit of the DSAV register indicates instead that the TXVOID bit is set (a NAK
has been sent to the host). This usage when TXDSAM = 1 does not require
MCSR.FEAT = 1.
6TXAV3
5
RXAV2
4TXAV2
3
RXAV1
2TXAV1
1
RXAV0
0TXAV0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RXAV7
TXAV7
RXAV6
TXAV6
RXAV5
TXAV5
RXAV4
TXAV4
R
R
RR
RR
RR
Bit
Symbol
Function/Description
7
RXAV7
Receive/Transmit Data Set Available. This feature is only available if MCSR.FEAT = 1
or TXDSAM = 1; otherwise, reads 0. May be used to improve firmware efficiency when
polling endpoints. For receive FIFOs, this register indicates that one or more data sets
are available to be read. For transmit FIFOs, this register indicates that one or more data
sets are available to be written. Bits always read 0 for endpoints which are not enabled
(RXEPEN/TXEPEN = 0). If a transmit endpoint has TXDSAM = 1, the corresponding
RXAV/TXAV bit of the DSAV register indicates instead that the TXVOID bit is set (a NAK
has been sent to the host). This usage when TXDSAM = 1 does not require
MCSR.FEAT = 1.
6TXAV7
5
RXAV6
4TXAV6
3
RXAV5
2TXAV5
1
RXAV4
0TXAV4



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