USB3280 Datasheet, PDF (10/42 Pages) SMSC Corporation – Hi-Speed USB Device PHY with UTMI Interface

Hi-Speed USB Device PHY with UTMI Interface
Datasheet
Table 4.2 Data Interface Signals
NAME
DATA[7:0]
(D7)
.
.
.
(D0)
TXVALID
(TXV)
TXREADY
(TXR)
RXVALID
(RXV)
RXACTIVE
(RXA)
RXERROR
(RXE)
DIRECTION
Bidirectional
Input
Output
Output
Output
Output
ACTIVE
LEVEL DESCRIPTION
High Data bus. 8-bit Bidirectional mode.
TXVALID
DATA[7:0]
0
output
1
input
High
Transmit Valid. Indicates that the DATA bus is valid for transmit. The
assertion of TXVALID initiates the transmission of SYNC on the USB
bus. The negation of TXVALID initiates EOP on the USB.
Control inputs (OPMODE[1:0], TERMSELECT,XCVRSELECT) must
not be changed on the de-assertion or assertion of TXVALID. The
PHY must be in a quiescent state when these inputs are changed.
High
Transmit Data Ready. If TXVALID is asserted, the SIE must always
have data available for clocking into the TX Holding Register on the
rising edge of CLKOUT. TXREADY is an acknowledgement to the
SIE that the transceiver has clocked the data from the bus and is
ready for the next transfer on the bus. If TXVALID is negated,
TXREADY can be ignored by the SIE.
High
Receive Data Valid. Indicates that the DATA bus has received valid
data. The Receive Data Holding Register is full and ready to be
unloaded. The SIE is expected to latch the DATA bus on the rising
edge of CLKOUT.
High
Receive Active. Indicates that the receive state machine has
detected Start of Packet and is active.
High
Receive Error.
0: Indicates no error.
1: Indicates a receive error has been detected.
This output is clocked with the same timing as the receive DATA lines
and can occur at anytime during a transfer.
NAME
DP
DM
Table 4.3 USB I/O Signals
DIRECTION
I/O
I/O
ACTIVE
LEVEL
DESCRIPTION
N/A USB Positive Data Pin.
N/A USB Negative Data Pin.
NAME
RBIAS
(RB)
XI/XO
Table 4.4 Biasing and Clock Oscillator Signals
DIRECTION
Input
Input
ACTIVE
LEVEL
DESCRIPTION
N/A External 1% bias resistor. Requires a 12kΩ resistor to ground.
Used for setting HS transmit current level and on-chip
termination impedance.
N/A External crystal. 24MHz crystal connected from XI to XO.
Revision 1.2 (10-27-06)
10
DATASHEET
SMSC USB3280