Table 30 – USB Configuration Number Register
USB_CONF
(0xAD - RESET=0x00)
NAME
USB CONFIGURATION NUMBER REGISTER
DESCRIPTION
BIT
[7:4]
{3:0}
R/W
R
Reserved
Always returns a “0”.
CONFIG
R
Reflects the current configuration number of the
USB97C201 system as set by the host.
Table 31 – Endpoint 0 Receive Control Register
EP0RX_CTL
(0xAF - RESET=0x00)
NAME
ENDPOINT 0 RECEIVE CONTROL REGISTER
DESCRIPTION
BIT
R/W
[7:4]
Reserved
R
This bit always reads “0”.
3
2
DTOG
STALL
R
This bit reflects the data toggle state of the last received
data token.
R/W
When set to a “1”, EP0 will respond with the STALL
handshake to OUT tokens EXCEPT a SETUP, which it will
ACK unconditionally. Either the internal SIE or the user may
set this bit. Receipt of a SETUP packet or USB RESET
clears this bit. Writing a “0” to this bit has no effect.
1
0
Reserved
ENABLE
R
R
This bit always reads “0”.
Reads 1 if EP0 Receive is enabled by SIE.
Table 32 – Endpoint 0 Transmit Control Register
EP0TX_CTL
(0xB1 - RESET=0x00)
NAME
ENDPOINT 0 TRANSMIT CONTROL REGISTER
DESCRIPTION
BIT
7
R/W
R
Reserved
Reserved
Reserved
TX
This bit always reads “0”.
6
R
This bit always reads “0”.
5
R
This bit always reads “0”.
4
R/W
When written with a “1”, allows the SIE to transfer data from
the buffer SRAM to EP0. OUT tokens will be NAK’d until the
transfer has been completed. It is cleared by the SIE when
transmission of the packet has been completed.
3
2
Reserved
STALL
R
This bit always reads “0”.
R/W
When set to a “1”, EP0 TX will respond with the STALL
handshake to IN tokens. . Either the internal SIE or the user
may set this bit. Receipt of a SETUP packet or USB RESET
clears this bit. Writing a “0” to this bit has no effect.
1
0
Reserved
ENABLE
R
R
This bit always reads “0”.
Reads “1” if EP0 Transmit is enabled by the SIE.
Table 33 – Endpoint 1 Receive Control Register
EP1RX_CTL
(0xB2 - RESET=0x00)
NAME
ENDPOINT 1 RECEIVE CONTROL REGISTER
DESCRIPTION
BIT
R/W
[7:4]
Reserved
R
This bit always reads “0”.
3
2
DTOG
STALL
R
This bit reflects the data toggle state of the last received
data token.
R/W
When set to a “1”, EP1 RX will respond with the STALL
handshake to OUT tokens. . Either the internal SIE or the
user may set this bit. Receipt of a “CLEAR FEATURE
ENDPOINT CLEAR” command for this endpoint or USB
SMSC DS – USB97C201
Page 32
Rev. 03/25/2002
PRELIMINARY
SMSC [ SMSC CORPORATION ]
