MIC2555_06 Datasheet, PDF (16/29 Pages) Micrel Semiconductor – USB – OTG Transceiver

Micrel, Inc.
USB Receive Operation
USB Mode
Suspend
0
0
0
0
DAT-SE0
1
1
1
1
0
0
0
0
VP-VM
1
1
1
1
MIC2555
Inputs
D+
D-
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
DAT_VP_RX
undefined
1
0
undefined
0
1
0
1
0
1
0
1
0
1
0
1
Outputs
SE0_VM_TX
1
0
0
0
1
0
0
0
0
0
1
1
0
0
1
1
RCV
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
undefined
1
0
undefined
n/a
n/a
n/a
n/a
If the transceiver is in the DAT-SE0 mode, and the
suspend bit has not been set, then the DAT_VP_RX pin
always follows the output of the differential receiver
during receive operation. The DAT_SE0 pin is not gated
by the outputs of the single ended receivers. In the VP-
VM mode, the RVC pin always follows the output of the
differential receiver. The RVC pin is not gated by the
outputs of the singled ended receivers.
UART mode: uart_en = 1
suspend DAT_VP SE0_VM
0
SE_DP TX data
1
Z
Z
Z = Tri-State
D+
RX data
Z
D-
SE0_VM
Z
Single-Ended Receivers
The Single Ended Receivers detect the logic levels on
the D+ and D- lines, and provide this information to the
Single Ended Decoder.
Single-Ended Decoder
Behavior of the Single-Ended Decoder is dependent
upon the power mode of the transceiver. If transceiver is
in the Suspend power mode, and dat_se0 = 1 (DAT-SE0
mode), then the DAT_VP_RX pin will reflect the output
of the D+ single ended receiver. This is necessary so
that a controller connected to the transceiver can detect
data pulsing while the transceiver is in suspended mode.
December 2006
16
M9999-121406