TL16PC564B, TL16PC564BLV

PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER

SLLS225A – MARCH 1996 – REVISED FEBRUARY 1998

7

POST OFFICE BOX 655303

detailed description

reset-validation circuit

A reset-validation circuit has been implemented to qualify the active-high RESET input. At power up, the level

on the RST output is unknown. Whenever RESET is stable for at least eight ARBCLKIs, RST reflects the

inverted state of that stable value of RESET. Any changes on RESET must be valid for eight ARBCLKI clocks

before the change is reflected on RST. This 8-clock filter provides needed hysteresis on the master reset input.

RST is driven by a low-noise, open-drain, fail-safe output buffer.

host CPU memory map

The host CPU attribute memory space is mapped as follows:

Host CPU Address Bits 9–1 (HA0 = 0)

Attribute Memory Space

0 – 255

CIS

256

CCR0

257

CCR1

258

CCR2

259

CCR3

260

CCR4

261

CCR5

262

CCR6

263

CCR7

The host CPU I/O space is mapped as follows:

Address Mode (hex)

Normal Mode

COM1

COM2

COM3

COM4

I/O Space

3F8

2F8

3E8

2E8

UART receiver buffer register (RBR) – read only

3F8

2F8

3E8

2E8

UART transmitter holding register (THR) – write only

3F8

2F8

3E8

2E8

UART divisor latch LSB (DLL)

3F9

2F9

3E9

2E9

UART interrupt enable register (IER)

3F9

2F9

3E9

2E9

UART divisor latch MSB (DLM)

2

3FA

2FA

3EA

2EA

UART interrupt identification register (IIR) – read only

2

3FA

2FA

3EA

2EA

UART FIFO control register (FCR) – write only

3

3FB

2FB

3EB

2EB

UART line control register (LCR)

4

3FC

2FC

3EC

2EC

UART modem control register (MCR) – bit 5 read only

5

3FD

2FD

3ED

2ED

UART line status register (LSR)

6

3FE

2FE

3EE

2EE

UART modem status rgister (MSR)

7

3FF

2FF

3EF

2EF

UART scratch register (SCR)

† DLAB is bit 7 of the line control register (LCR).

subsystem memory map

The subsystem attribute memory space is mapped as follows:

Subsystem Address Bits 8 – 0

Attribute Memory Space

0 – 255

CIS

256

CCR0

257

CCR1

258

CCR2

259

CCR3

260

CCR4

261

CCR5

262

CCR6

263

CCR7