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Table 3-7
Signal Descriptions (Continued)
Multiplexed
1
Signal Name
Signal(s)
[CTS_U] (UART)
[DCE_TCLK_D]
[PCM_FSC_D]
CC
PIO24
[CTS_HU] (High-
Speed UART)
[PCM_TSC_D]
CC
[DCE_CTS_D]
PIO46
CC
HDLC Channel A (GCI)
DCE_RXD_A
CC
[GCI_DD_A]
[PCM_RXD_A]
DCE_TXD_A
[GCI_DU_A]
CC
[PCM_TXD_A]
DCE_RCLK_A
[GCI_DCL_A]
CC
[PCM_CLK_A]
DCE_TCLK_A
CC
[GCI_FSC_A]
[PCM_FSC_A]
UNIVERSAL SERIAL BUS (USB)
[UDMNS]
CC CU
USBD–
USBD+
[UDPLS]
CC CU
USBD+
CC CU
[UDPLS]
[UDMNS]
USBD–
CC CU
[UCLK]
[USBSOF]
[USBSCI]
CC CU
PIO21
[UCLK]
[USBSCI]
CC CU
[USBSOF]
PIO21
RSVD_102
UTXDMNS
CC CU
System Overview
Type Description
PCM Frame Synchronization Clock provides the Frame
STI
Synchronization Clock input (usually 8 kHz) for the channel D
PCM Highway interface.
PCM Time Slot Control D enables an external buffer device
OD
when channel D PCM Highway data is present on the
[PCM_TXD_D] output pin in PCM Highway mode.
BO
GCI Data Downstream is the serial data input pin for the channel
D
A GCI interface.
BO
GCI Data Upstream is the serial data output pin for the channel
D
A GCI interface.
GCI Data Clock is the single transmit and receive channel A
STI
GCI data clock input generated by an upstream device. The data
clock frequency must be twice the data rate.
GCI Frame Synchronization Clock provides the 8-kHz Frame
STI
Synchronization Clock input for the channel A GCI interface
generated by an upstream device.
CC CU
USB External Transceiver Gated Differential Plus and USB
External Transceiver Gated Differential Minus are inputs from
the external USB transceiver used to detect single-ended zero
and error conditions. The signals have the following meanings:
STI
STI
USB Differential Plus and USB Differential Minus form the
B
bidirectional electrical data interface for the USB port. The pins
form a differential pair that can be connected to a physical USB
B
connector without an external transceiver.
USB Sample Clock Input is used to synchronize an external
clock to the internal USB peripheral controller for isochronous
STI
transfers.
USB Start of Frame is a 1-kHz frame pulse used to synchronize
USB isochronous transfers to an external device on a frame-by-
O
frame basis.
USB External Transceiver Differential Minus is an output that
O
drives the external transceiver differential driver minus input.
Am186™CC/CH/CU Microcontrollers User's Manual
USB External Transceiver Signals
UDPLS
UDMNS
0
0
0
1
1
0
1
1
Status
Single-Ended Zero
(SE0)
Full speed
Reserved
Error
3-27
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