LPC3130_3131 NXP Semiconductors, LPC3130_3131 Datasheet - Page 23
LPC3130_3131
Manufacturer Part Number
LPC3130_3131
Description
The NXP LPC3130/3131 combine an 180 MHz ARM926EJ-S CPU core, high-speed USB2
Manufacturer
NXP Semiconductors
Datasheet
1.LPC3130_3131.pdf
(68 pages)
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NXP Semiconductors
LPC3130_3131_1
Preliminary data sheet
6.14 APB bridge
6.15 Clock Generation Unit (CGU)
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:
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
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.
•
•
•
•
•
•
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
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.
Rev. 1 — 9 February 2009
Low-cost, low-power ARM926EJ-S microcontrollers
LPC3130/3131
Figure
6. Each output clock
© NXP B.V. 2009. All rights reserved.
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