SIO1007 datasheet(57/108 Pages) MICROCHIP

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DS00002020A-page 57

SIO1007

18.0

CONFIGURATION

The configuration of the SIO1007 is programmed through hardware selectable Configuration Access Ports that appear

when the chip is placed into the configuration state. The SIO1007 logical device blocks, if enabled, will operate normally

in the configuration state.

18.1

Configuration Access Ports

The Configuration Access Ports are the CONFIG PORT, the INDEX PORT, and the DATA PORT (Table 18-2). The base

address of these registers is controlled by the nRTS/SYSOPT0 and nDTS/SYSOPT1 pins and by the Configuration Port

Base Address registers CR12 and CR13. The configuration base address at power-up is determined by the SYSOPT

strap option. The SYSOPT strap option is latched state of the nRTS/SYSOPT0 and nDTS/SYSOPT1 pins at the deas-

serting edge of PCIRST#. The nRTS/SYSOPT0 pin determines the lower byte of the Base Address and the nDTS/SYS-

OPT1 pin determines the upper byte of the Base Address. See Table 18-1 Default Configuration Access Ports Base

Address Decoded from the SYSOPT Strap Option.

APPLICATION NOTE: The nRTS1/SYSOPT0 and the nDTS1/SYSOPT1 pins require external pullup/pull-down

resistors to set the default base I/O address for configuration to 0x002E, 0x004E, 0x162E,

or 0x164E.

Note 18-1

The INDEX and DATA ports are active only when the SIO1007 is in the configuration state.

Note 18-2

The INDEX PORT is only readable in the configuration state.

18.2

Configuration State

The configuration registers are used to select programmable chip options. The SIO1007 operates in two possible states:

the run state and the configuration state. After power up by default the chip is in the run state. To program the config-

uration registers, the configuration state must be explicitly enabled. Programming the configuration registers typically

follows this sequence:

Enter the Configuration State,

Program the Configuration Register(s),

Exit the Configuration State.

18.2.1

ENTERING THE CONFIGURATION STATE

To enter the configuration state write the Configuration Access Key to the CONFIG PORT. The Configuration Access

Key is one byte of 55H data. The SIO1007 will automatically activate the Configuration Access Ports following this pro-

cedure.

TABLE 18-1:

DEFAULT CONFIGURATION ACCESS PORTS BASE ADDRESS DECODED FROM

THE SYSOPT STRAP OPTION

SYSOPT1

SYSOPT0

Default CONFIG Port/ Index Port Address

0x002E

0x004E

0x162E

0x164E

TABLE 18-2:

CONFIGURATION ACCESS PORTS

Port Name

Relative Address

Type

CONFIG PORT

Configuration Access Ports Base Address + 0

WRITE

INDEX PORT

Configuration Access Ports Base Address + 0

READ/WRITE

(Note 18-1, Note 18-2)

DATA PORT

Configuration Access Ports Base Address + 1

READ/WRITE

(Note 18-2)

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