VR4102 datasheet(688/701 Pages) NEC

688 / 701 page

APPENDIX A DIFFERENCES BETWEEN VR4102 AND VR4101

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A.2.4 DMA

(1) Sources of DMA

The VR4102 uses DMA transfer for AIU reception, AIU transmission, and FIR transmission/reception (in priority

order). On the other hand, the VR4101 uses DMA transfer for AIU, PIU, SIU reception, SIU transmission, and

KIU (in priority order).

(2) DMA Operation

The VR4102 reloads the DMA base address every time the DMA transfer reaches page boundary. The VR4101

uses DMA address space linearly which starts at DMA base address. For more details about DMA address

manipulation, see Chapter 11.

A.2.5 ICU

(1) Sources of Interrupts

Compared with the VR4101, five interrupt sources, HSP, LED, FIR, RTC Long timer 2, and TClock counter, are

newly added in the VR4102 ICU. Three more software interrupts which are caused by setting the SOFTINTREG

DSIU, GIU, KIU, AIU, PIU, KIU in Suspend mode, and PIU in Suspend mode.

(2) Notification to the CPU Core

In the VR4102, NMI and Int[3..0] signals are used to notify interrupt requests to the CPU core, in contrast to the

VR4101 which uses NMI and Int[1..0] signals.

A.2.6 PMU

(1) Power-On Function

Compared with the VR4101, GPIO[3..0] and GPIO[12..9] inputs are added in the VR4102 as a CPU activation

factor. Especially, GPIO[3] can be used without any settings immediately after RTCRST.

(2) BATTLOCK and CARDLOCK Notifications

No dedicated pins for BATTLOCK and CARDLOCK functions are assigned in the VR4102.

They must be

assigned to either of GPIO[12..9] pins and they are manipulated as two of GIU interrupts.

A.2.7 RTC

(1) RTC Long Timers

The VR4102 has two RTC Long timers, on the other hand the VR4101 has only one.

(2) TClock Counter

TClock counter of the VR4102 is 25-bit long which is 6 bits shorter than that of the VR4101.

TClock counter of the VR4102 is added as one of the interrupt factors, and an interrupt request occurs when its

value becomes 1. In the VR4101, no interrupt request is caused by TClock counter.

VR4102 Datasheet(PDF) 688 Page - NEC