PCM16C02 datasheet(21/42 Pages) NSC

21 / 42 page

60 Operational Modes

61 INITIAL SETUP (RESET) AND CONFIGURATION

In order to set up the IO windows the Function Base Reg-

isters 0 1 and the Function Limit Registers 0 1 must be

loaded These registers are loaded with base address infor-

mation gained from reading the TPCE

IO field within the

Card Configuration Table Entry Tuple (CISTPL

CFTA-

BLE

ENTRY 1Bh) in the CIS (Card Information Structure)

This will allow the system software to configure the windows

and set the IO addresses for each function The software

locates the Configuration Option Registers based on ad-

dress offset values stored in the TPCC

RADR field within

the Configuration Tuple (CISTPL

CONFIG 1Ah) in the

CIS Upon a subsequent readwrite operation from the PC

Card host to the current IO window address

the

PCM16C02 decodes for a match and then passes the ap-

propriate data address and control signals to the appropri-

ate function port Note the Attribute memory CIS is initially

loaded from the EEPROM upon reset

62 RESET CONDITIONS

When the device is reset using the reset pin the following

actions take place First the attribute memory CIS is re-

loaded from the EEPROM The Function Configuration Op-

tion Registers 0 1 are reset to a value of 00 Hex All other

registers are set to their default values

63 INTERRUPT CONTROL

For multi-function operation the PCM16C02 implements a

shared interrupt scheme The PCM16C02 will assert PC

Card IREQ

when either CINT(0) or CINT(1) is asserted If

the Function Configuration Option Register is configured for

pulsed mode interrupts the IREQ

pin will send out a pulse

width of period 16fMCLK(0) During multi-function operation

however level mode interrupts are strongly recommended

The Function Configuration Status Registers indicate which

function initiated the interrupt and interrupts will continue

until the interrupt requests are processed This mode would

be used if both functions are running at the same time (con-

currently)

See the description of the IntrReset bit in the Function Con-

figuration Status Registers 0 1 for a multi-function interrupt

protocol that insures multiple interrupts sharing one IREQ

line are not missed

64 FUNCTIONAL CONCURRENCY

A Dual Function Card may be designed using the

PCM16C02 IC that allows both functions to run concurrent-

65 16-BIT8-BIT OPERATION

During normal operation the PCM16C02 will function as a

16-bit device If 8-bit operation is desired (PC Card Host

accesses are 8-bit) the PCM16C02 will pass the 8-bit trans-

action to the Function With the common memory device

the PCM16C02 will check the Memls8 bit in the Pin Polarity

will strobe MEMWEL

for 8-bit accesses on even address

boundaries and MEMWEH

for 8-bit accesses on odd ad-

dress boundaries A 16-bit access causes both MEMWEL

and MEMWEH

to be strobed If Memls8 is set (8-bit mem-

ory) the PCM16C02 will strobe MEMWEL

for 8-bit PC

Card accesses on odd or even address boundaries For 16-

bit access the PCM16C02 will only obtain one byte of data

by strobing MEMWEL

66 SPECIAL TESTABILITY MODES

National Proprietary TEST(0) pin should be left disconnect-

Software

System or device software can interact with the PCM16C02

IC directly using either the PCM16C02’s PC Card registers

PC Card Extended registers or PCM16C02 specific regis-

ters

CIS (CARD INFORMATION STRUCTURE)

When the PCM16C02 powers on the contents of the

EEPROM are loaded into the device’s shadow RAM This

not only allows attribute memory accesses to the CIS but it

also provides defaults for 9 PCM16C02 specific registers to

be loaded This allows default loading of parameters that

are transparent to system or device software The best use

is for the card manufacturer to determine what values these

should be and program them into the EEPROM when the

CIS is programmed Either system software such as Card

ServicesSocket Services or device software may read and

parse the CIS by accessing attribute memory on the PC

Card If desired this software agent may write to the CIS or

default EEPROM registers and if desired have these new

values saved to the EEPROM The actual contents of the

CIS and the static registers is PC Card design dependent

PCM16C02 Datasheet(PDF) 21 Page - National Semiconductor (TI)

PCM16C02 Datasheet(HTML) 21 Page - National Semiconductor (TI)

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