PC87334VLJ datasheet(83/102 Pages) NSC

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80 Integrated Device Electronics

Interface (IDE) (Continued)

The IDE Interface Circuit has some additional IDE DMA sup-

port When bit 1 of FCR is 1 the PC87334 IDE responds to

a DMA acknowledgement on the IDEACK input pin as fol-

lows

a) IDEL0 is asserted when IDEACK is asserted and either

RD or WR is asserted

b) IDED7 is functional (ie read IDED7 to D7 write D7 to

IDED7) when IDEACK is asserted and either RD or WR is

asserted

c) HCS10 are not asserted on DMA cycles

The equations shown in

Figure 8-1 define the signals of the

PC87334 IDE pins

90 Serial Infrared Interface (SIR)

The SIR is a two-way wireless communication port using

infrared as a transmission medium The SIR connects the

Infrared Receive Data (IRRX) and Infrared Transmit Data

(IRTX) signals via transmitter LED(s) and receiver photo di-

ode(s) Serial Out (SOUT) is encoded by the PC87334 into

the IRTX signal The received signal IRRX is decoded back

by the PC87334 to generate the required Serial In (SIN)

signal

The SIR is connected to UART2 of the PC87334 There are

two UART2 interface modes

1 Normal (Modem) mode The normal 16550 UART inter-

face

2 SIR mode Infrared Data Association (IrDA) standard

compliant interface

A system with a PC87334 can be assembled with two serial

ports and one infrared port Either two serial ports or one

serial and one infrared port can be selected at run-time

Normal (Modem) mode implies two UARTs (Serial) SIR

mode implies one UART and one SIR (Infrared)

The SIR is in either Full Duplex or Half Duplex configuration

1 Full Duplex both transmitter and receiver are enabled

simultaneously

2 Half Duplex the receiver is blocked when the transmitter

is on

The SIR output signal (IRTX) when active is active for inter-

vals of either 16 ms or 316 baud

Both SIR signals are provided on

1 Two UART2 control pins The UART is still functional

except for two control signals (DSR and DTR) or

2 Two IDE pins The IDE is still functional except for sup-

port of 3F7h read (in this case all 16 data bits of the IDE

should be handled by external buffer(s) and 3F7h read

belongs only to the FDC)

The PC87334 directly interfaces with an infrared transceiver

analog front-end device The PC87334 can also be inter-

faced with discrete LED and photo-diode devices via an ex-

ternal analog circuit

The configuration of UART2 via the PC87334 configuration

registers (FER FAR PTR PMC and TUP) remains the

same with the addition of a new register IRCInfrared

Configuration Register See Section 2510 for a description

of IRC

Equations

Comments

HCS0 e A9 A8 A7 A6 A5 A4 A3 AEN

Active at 1F0 – 1F7

HCS1 e A9 A8 A7 A6 A5 A4 A3 A2 A1 AEN

Active at 3F6 3F7

IDELO e HCS0 (RD a WR) a HCS1

(WR A0) a RD

Write 1F0 – 1F7 3F6 Read 1F0 – 1F7 3F6 3F7

IDEHI e IOCS16 HCS0 (RD a WR)

Read or Write 1F0 – 1F7 in AT Mode

IDED7 (read) e (HCS0 RD) a (HCS1 A0) RD

Provides D7 during Read 1F0 – 1F7 and 3F6

IDED7 (write) e WR HCS0 a (HCS1 A0)

Provides D7 during Write 1F0 – 1F7 and 3F6

FIGURE 8-1 IDE Interface Signal Equations (Non-DMA)

PC87334VLJ Datasheet(PDF) 83 Page - National Semiconductor (TI)

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