LPC3131 datasheet(23/68 Pages) NXP

23 / 68 page

LPC3130_3131_1

Preliminary data sheet

Rev. 1 — 9 February 2009

23 of 68

NXP Semiconductors

LPC3130/3131

Low-cost, low-power ARM926EJ-S microcontrollers

• Supports all combinations of 32-bit masters and slaves (fully connected interconnect

matrix).

• Round-robin priority mechanism for bus arbitration: all masters have the same priority

and get bus access in their natural order

• Four devices on a master port (listed in their natural order for bus arbitration):

– DMA

– ARM926 instruction port

– ARM926 data port

– USB OTG

• Devices on a slave port (some ports are shared between multiple devices):

– AHB to APB Bridge 0

– AHB to APB Bridge 1

– AHB to APB Bridge 2

– AHB to APB Bridge 3

– AHB to APB Bridge 4

– Interrupt Controller

– NAND ﬂash controller

– MCI SD/SDIO

– USB 2.0 high-speed OTG

– 96 kB ISRAM

– 96 kB ISRAM (LPC3131 only)

– 128 kB ROM

– MPMC

6.14 APB bridge

The APB bridge is a bus bridge between the AMBA Advanced High-performance Bus

(AHB) and the ARM Peripheral Bus (APB) interface.

The module supports two different architectures:

• Single-clock architecture, synchronous bridge. The same clock is used at the AHB

side and at the APB side of the bridge. The AHB-to-APB4 bridge uses this

architecture.

• Dual-clock architecture, asynchronous bridge. Different clocks are used at the AHB

side and at the APB side of the bridge. The AHB-to-APB0, AHB-to-APB1,

AHB-to-APB2, and AHB-to-APB3 bridges use this architecture.

6.15 Clock Generation Unit (CGU)

The clock generation unit generates all clock signals in the system and controls the reset

signals for all modules. The structure of the CGU is shown in Figure 6. Each output clock

generated by the CGU belongs to one of the domains. Each clock domain is fed by a

single base clock that originates from one of the available clock sources. Within a clock

domain, fractional dividers are available to divide the base clock to a lower frequency.

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