LPC47M14X datasheet(159/205 Pages) SMSC

159 / 205 page

SMSC DS – LPC47M14X

Page 159

Rev. 03/19/2001

ADDRESS

DESCRIPTION

STATE

TEST 3

Default = 0x00, on

VCC POR and

VTR POR

0x2F R/W

Test Modes: Reserved for SMSC. Users should not

write to this register, may produce undesired results.

Note 1:

CR22 Bit 5 is reset by VTR POR only.

Note 2:

To allow the selection of the configuration address to a user defined location, these Configuration Address

Bytes are used. There is no restriction on the address chosen, except that A0 is 0, that is, the address must be on an

even byte boundary. As soon as both bytes are changed, the configuration space is moved to the specified location with

no delay (

Note: Write byte 0, then byte 1; writing CR27 changes the base address).

The configuration address is only reset to its default address upon a Hard Reset or Vcc POR.

Note: The default configuration address is either 02E or 04E, as specified by the SYSOPT pin.

Logical Device Configuration/Control Registers [0x30-0xFF]

Used to access the registers that are assigned to each logical unit. This chip supports nine logical units and has nine

sets of logical device registers. The nine logical devices are Floppy, Parallel, Serial 1, Serial 2, Keyboard Controller,

game port, PME, MPU-401, and USB Hub. A separate set (bank) of control and configuration registers exists for each

logical device and is selected with the Logical Device # Register (0x07).

The INDEX PORT is used to select a specific logical device register. These registers are then accessed through the

DATA PORT.

The Logical Device registers are accessible only when the device is in the Configuration State. The logical register

addresses are shown in the table below.

Table 63 – Logical Device Registers

LOGICAL DEVICE

ADDRESS

DESCRIPTION

STATE

Activate (Note 1)

Default = 0x00

on VCC POR, VTR POR,

HARD RESET and

SOFT RESET

(0x30)

Bits[7:1] Reserved, set to zero.

Bit[0]

= 1

Activates the logical device currently

selected through the Logical Device #

= 0

Logical device currently selected is

inactive

Logical Device Control

(0x31-0x37)

Reserved – Writes are ignored, reads return 0.

Logical Device Control

(0x38-0x3F) Vendor Defined - Reserved - Writes are

ignored, reads return 0.

Memory Base Address

(0x40-0x5F) Reserved – Writes are ignored, reads return 0.

I/O Base Address (Note 2)

(see Device Base I/O

Address Table)

Default = 0x00

on VCC POR, VTR POR,

HARD RESET and

SOFT RESET

(0x60-0x6F)

0x60,2,... =

addr[15:8]

0x61,3,... =

addr[7:0]

Registers 0x60 and 0x61 set the base address

for the device. If more than one base address

is required, the second base address is set by

registers 0x62 and 0x63.

Refer to Table 65 for the number of base

address registers used by each device.

Unused registers will ignore writes and return

zero when read.

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