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82551QM Datasheet(PDF) 49 Page - Intel Corporation

Part # 82551QM
Description  Fast Ethernet Multifunction PCI/CardBus Controller
PDF  120 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

82551QM Datasheet(HTML) 49 Page - Intel Corporation

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Networking Silicon — 82551QM
Datasheet
43
7.0
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:
• 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
7.1
PCI Address Mapping to the Modem
The modem can be accessed by the PCI bus through either I/O or memory mapping.
7.2
Modem Read and Write Cycles
Basic read/write cycles to the modem device are shown in the figure below.
Figure 13. Modem Read/Write Cycles
7.3
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.
t1
t4
t2
t6
t8
t3
t7
t5
Modem AEN (CS#)
Modem Addrsess
Modem Data In / Out
Modem WE# / RD#
Modem IOCHRDY
t10
t11
t9
t6'



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