LU82551QM 860611 Intel, LU82551QM 860611 Datasheet - Page 49
LU82551QM 860611
Manufacturer Part Number
LU82551QM 860611
Description
Manufacturer
Intel
Datasheet
1.LU82551QM_860611.pdf
(120 pages)
Specifications of LU82551QM 860611
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (min)
3V
Operating Supply Voltage (max)
3.6V
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
196
Lead Free Status / RoHS Status
Compliant
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7.0
7.1
7.2
7.3
Datasheet
Figure 13. Modem Read/Write Cycles
Modem Functionality
The local port mimics the standard 8-bit interface of a modem to the host system and emulates a
16550 Universal Asynchronous Receiver/Transceiver (UART) modem interface. The modem
interface includes the following:
PCI Address Mapping to the Modem
The modem can be accessed by the PCI bus through either I/O or memory mapping.
Modem Read and Write Cycles
Basic read/write cycles to the modem device are shown in the figure below.
Modem and Preboot eXtension Environment Coexistence
The 82551QM local bus can interface with a Flash device or modem without external support.
External logic can be implemented on the circuit board to support both devices by using the
Modem Chip Select (MDMCS#) and Flash Chip Select (FLCS#) signals.
•
•
•
Modem Data In / Out
Modem WE# / RD#
Modem AEN (CS#)
8-bit data bus: FLD7:0
Control signals: AEN (FLCS#), MCNTSM# (FLA12), MINT (FLA11), MRING# (FLA10),
MRST (FLA9), RD# (FLOE#), and WR# (FLWE#)
4 address lines
Modem IOCHRDY
Modem Addrsess
t1
t2
t4
t9
t6'
Networking Silicon — 82551QM
t8
t10
t6
t3
t7
t5
t11
43
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