TL16PNP200 Datasheet, PDF (18/23 Pages) Texas Instruments – STANDALONE PLUG-AND-PLAY (PnP) CONTROLLER

TL16PNP200
STANDALONE PLUGĆANDĆPLAY (PnP) CONTROLLER
SLLS229A − NOVEMBER 1995 − REVISED APRIL 1996
PRINCIPLES OF OPERATION
PnP registers
PnP card standard registers are divided into three parts: card control, logical device control, and logical device
configuration. There is one of each card control register on each ISA card. Card control registers are used for
global functions that control the entire card. Logical device control registers and logical device configuration
registers are repeated for each logical device. All unimplemented configuration registers are reset to 0 when
read.
PnP card control registers
The PnP card control registers are listed in Table 6. All registers are cleared to 0 on power-up.
Table 6. PnP Card Control Registers
ADDRESS PORT
0×00
0×01
0×02
0×03
0×04
0×05
0×06
0×07
REGISTER NAME
ACCESSIBILITY
SET RD_DATA PORT
Write only
Writing to this register modifies the address port used for reading from the PnP ISA card. Writing to this register is only
allowed when the card is in the isolation state.
Bit [7-0] These bits become I/O port address bits 9-2.
SERIAL ISOLATION
Read only
Reading from this register causes a card in the isolation state to compare one bit of the board ID.
CONFIGURATION CONTROL
Write only
This 3-bit register consists of three independent commands, which are activated by writing a 1 to their corresponding
register bits. These bits are automatically reset to 0 by the hardware after the commands execute.
Bit [2]
Writing a 1 to this bit causes the card to reset its CSN and RD-DATA port to zero.
Bit [1]
Writing a 1 to this bit causes the card to enter the wait-for-key state, but the card CSN is
preserved and the logical device is unaffected.
Bit [0]
Writing a 1 to this bit resets the logical device’s configuration registers to their default state, and the CSN
is preserved.
WAKE[CSN]
Write only
Writing to this register, when the write data [7-0] matches the card CSN, causes the card to go from the sleep state either
to the isolation state when the write data for this command is zero, or to the configuration state when the write data is not
zero. The pointer to the SERIAL IDENTIFIER is reset. This register is write only.
RESOURCE DATA
Read only
Reading from this register reads the next byte of resource information from the EEPROM. The STATUS register must be
polled until its bit 0 is set before this register may be read.
STATUS
Read only
Bit [0]
A one-bit register that, when set, indicates that it is okay to read the next data byte from the
RESOURCE DATA register.
CARD-SELECT NUMBER
Read/write
Writing to this register sets the CSN of a card, which is uniquely assigned to a card after the serial identification process.
This allows each card to be individually selected during a Wake[CSN] command.
LOGICAL DEVICE NUMBER
Read/write
This register specifies which logical device is being configured.
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