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ISP1130

Universal Serial Bus compound hub with integrated keyboard controller

Philips Electronics 

Philips Semiconductors

ISP1130

USB compound hub with keyboard controller

Table 2: Pin description (SSOP56 and SDIP56)…continued

Symbol [1]

Pin

Type Description

MEMSEL/

47

O

UPGL

pin function is controlled via the USBCON register (see

Table 53):

GL-MEMSELSelection = 0 — upstream port GoodLink

indicator output (open-drain)

GL-MEMSELSelection = 1 — chip select output for

external serial EEPROM (open-drain)

SYNCLK

48

O

embedded microcontroller clock output; used for emulation

EA

49

I

External Address enable input (internal pull-up); used to

access external memory

ALE

50

O

Address Latch Enable output; used to demultiplex AD0

during external memory access

PSEN

51

O

Program Store ENable output; selects external memory for

program execution

INT

52

I

external interrupt input (edge-triggered)

SCRLOCK 53

O

control output for Scroll Lock LED (open-drain)

NUMLOCK 54

O

control output for Num Lock LED (open-drain)

CAPSLOCK 55

O

control output for Caps Lock LED (open-drain)

GND

56

-

ground supply

[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.

[2] MXn pins have an internal 8.2 kΩ pull-up resistor.

[3] MYn pins have an internal 82 kΩ pull-down resistor (keyboard matrix enabled) or an internal 8.2 kΩ

pull-up resistor (keyboard matrix disabled). This is controlled by bit DisableKBDMatrix in the USBCON

register, see Table 53.

6. Functional description

The ISP1130 is a compound USB hub with an integrated keyboard controller. It has 2

bus-powered downstream ports with 3 non-removable embedded functions, the first

of which is dedicated to the keyboard function. The downstream ports can be used to

connect low-speed or full-speed USB peripherals, such as a mouse, printer, another

keyboard or another hub. The block diagram is shown in Figure 1.

The embedded functions have no external hardware connections. They provide USB

endpoints for equipment functions implemented by a microcontroller. Each endpoint

has an associated FIFO buffer in the on-board RAM, which can be accessed by the

integrated microcontroller via memory mapped registers using special commands

(see Section 9).

An optional serial I2C-bus interface (see Section 11) is provided for external

EEPROM access, allowing the user to program the vendor ID, product ID or activate

the built-in keyboard matrix.

9397 750 06895

Objective specification

Rev. 01 — 23 March 2000

© Philips Electronics N.V. 2000. All rights reserved.

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