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ISP1130N Datasheet(PDF) 7 Page - NXP Semiconductors |
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ISP1130N Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 68 page  Philips Semiconductors ISP1130 USB compound hub with keyboard controller Objective specification Rev. 01 — 23 March 2000 7 of 68 9397 750 06895 © Philips Electronics N.V. 2000. All rights reserved. [1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals. [2] MXn pins have an internal 8.2 k Ω pull-up resistor. [3] MYn pins have an internal 82 k Ω 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. MEMSEL/ UPGL 47 O 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 Table 2: Pin description (SSOP56 and SDIP56)…continued Symbol [1] Pin Type Description |
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