CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 144

• Manufacturer Part Number: CS5535-UDCF
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of CS5535-UDCF

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

5.12.3
The dongle interface on the Geode CS5535 companion
device is not a fully hardware compatible interface. The
real dongle interface requires six external interface signals
and the Geode CS5535 companion device only supports
three. With only three signals, the dongle interface sup-
ports a subset of the real dongle interface through virtual-
ization.
5.12.3.1 Real Dongle
The real dongle interface uses six multiplexed pins for don-
gle identification, data transfer, and transceiver configura-
tion. Figure 5-36 on page 144 illustrates the real dongle
interface and Table 5-21 provides the interface signals and
their descriptions.
Only three signals (IRTX, IRRX, and ID0/IRSL0/IRRX2)
are used for the IR interface. It has three phases:
Phase 1:
Phase 2:
Phase 3:
144
Change the ID0-ID3 bits to input mode, and read the
status to complete primary identification of the dongle.
Change ID1 and ID2 as output and read the status of
ID0 and ID3 to complete the secondary dongle identifi-
cation phase. This phase provides information about
the connected dongle.
Dongle Interface
Controller
IR
31506B
ASIC Boundary
Transceiver Select Logic
Figure 5-36. Real Dongle Interface
IRTX
IRRXI
ID0/IRSL0/IRRX2
ID1/IRSL1
ID2/IRSL2
ID3
IrDa-Data Transceiver with Receive Channels
Signal Name
IRTX
IRRX
ID0/IRSL0/IRRX2
ID1/IRSL1
ID2/IRSL2
ID3
Configure mode: Change IRSL[2:0] as an output and
configure the transceiver for the required mode. If two
infrared inputs are required, change IRSL0 to an input
to give the second receiver channel IRRX2. The
IRSL2 and IRSL1 are configured as outputs to keep
the transceiver in the required mode.
Table 5-21. Real Dongle Interface Signals
AMD Geode™ CS5535 Companion Device Data Book
RX-B
RX-A
Type
I/O
I/O
I/O
I/O
O
I
TX
Description
Infrared transmit data
Infrared receive data
Identification signal 0
Infrared mode select 0
Infrared receive data for
transceivers with two RX
channels
Identification signal 1
Infrared mode select 1
Identification signal 2
Infrared mode select 2
Identification signal 2
Resistance
Shielded
Cable
Pull-up
UART and IR Port
V
CC