FDC37M607 datasheet(122/182 Pages) SMSC

122 / 182 page

122

CONFIGURATION

The Configuration of the FDC37M60x is very

flexible and is based on the configuration

architecture implemented in typical Plug-and-

Play components. The FDC37M60x is designed

for

motherboard

applications

which

the

resources required by their components are

known.

With its flexible resource allocation

architecture, the FDC37M60x allows the BIOS to

assign resources at POST.

SYSTEM ELEMENTS

Primary Configuration Address Decoder

After a hard reset (RESET_DRV pin asserted) or

Vcc Power On Reset the FDC37M60x is in the

Run Mode with all logical devices disabled. The

logical devices may be configured through two

standard Configuration I/O Ports (INDEX and

DATA)

placing

the FDC37M60x into

Configuration Mode.

The BIOS uses these

configuration

ports

initialize

the

logical

devices at POST. The INDEX and DATA ports

are only valid when the FDC37M60x is in

Configuration Mode.

The SYSOPT pin is latched on the falling edge

of the RESET_DRV or on Vcc Power On Reset

to determine the configuration register's base

address. The SYSOPT pin is used to select the

CONFIG

PORT's

I/O address at power-up.

Once powered up the configuration port base

address can be changed through configuration

registers CR26 and CR27. The SYSOPT pin

is a hardware configuration pin which is

shared with the nRTS1 signal on pin 87.

During reset this pin is a weak active low signal

which sinks 30µA. Note: All I/O addresses are

qualified with AEN.

The INDEX and DATA ports are effective only

when the chip is in the Configuration State.

PORT NAME

SYSOPT= 0

(PULL-DOWN RESISTOR)

REFER TO NOTE 1

SYSOPT= 1

(10K PULL-UP

RESISTOR)

TYPE

CONFIG PORT (Note 2)

0x03F0

0x0370

Write

INDEX PORT (Note 2)

0x03F0

0x0370

Read/Write

DATA PORT

INDEX PORT + 1

Read/Write

Note 1: If using TTL RS232 drivers use 1K pull-down. If using CMOS RS232 drivers use 10K

pull-down.

Note 2: The configuration port base address can be relocated through CR26 and CR27.

Entering the Configuration State

The device enters the Configuration State when

the following Config Key is successfully written

to the CONFIG PORT.

Config Key = < 0x55 >

Exiting the Configuration State

The device exits the Configuration State when

the following Config Key is successfully written

to the CONFIG PORT.

Config Key = < 0xAA>

FDC37M607 Datasheet(PDF) 122 Page - SMSC Corporation

FDC37M607 Datasheet(HTML) 122 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL