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IMX51A

i.MX51A Automotive and Infotainment Applications Processors

Freescale Semiconductor 

Features

Table 2. i.MX51A Digital and Analog Modules (continued)

Block

Mnemonic

Block Name Subsystem

Brief Description

SJC

Secure JTAG System

JTAG manipulation is a known hacker’s method of executing unauthorized

Interface

Control

program code, getting control over secure applications, and running code in

Peripherals privileged modes. The JTAG port provides a debug access to several hardware

blocks including the ARM processor and the system bus.

The JTAG port must be accessible during platform initial laboratory bring-up,

manufacturing tests and troubleshooting, as well as for software debugging by

authorized entities. However, in order to properly secure the system,

unauthorized JTAG usage should be strictly forbidden.

SPBA

SPDIF

SRTC

SSI-1

SSI-2

SSI-3

TVE

Shared

Peripheral

Bus Arbiter

System

Control

Peripherals

Sony Philips

Digital

Interface

Multimedia

Peripherals

Secure Real Security

Time Clock

I2S/SSI/AC97 Connectivity

Interface

Peripherals

TV Encoder Multimedia

In order to prevent JTAG manipulation while allowing access for manufacturing

tests and software debugging, the i.MX51A processor incorporates a

mechanism for regulating JTAG access. The i.MX51A Secure JTAG Controller

provides four different JTAG security modes that can be selected via e-fuse

configuration.

SPBA (Shared Peripheral Bus Arbiter) is a two-to-one IP bus interface (IP bus)

arbiter.

A standard digital audio transmission protocol developed jointly by the Sony and

Philips corporations. Only the transmitter functionality is supported.

The SRTC incorporates a special System State Retention Register (SSRR) that

stores system parameters during system shutdown modes. This register and all

SRTC counters are powered by dedicated supply rail NVCC_SRTC_POW. The

NVCC_SRTC_POW can be energized even if all other supply rails are shut

down. The power for this block comes from NVCC_SRTC_POW supply. When

this supply is driven by the MC13892 power management controller, this block

can be power backed up via the coin-cell feature of the MC13892.This register

is helpful for storing warm boot parameters. The SSRR also stores the system

security state. In case of a security violation, the SSRR mark the event (security

violation indication).

The SSI is a full-duplex synchronous interface used on the i.MX51A processor

to provide connectivity with off-chip audio peripherals. The SSI interfaces

connect internally to the AUDMUX which interfaces to the i.MX51 system

memory. The SSI supports a wide variety of protocols (SSI normal, SSI network,

I2S, and AC-97), bit depths (up to 24 bits per word), and clock/frame sync

options.

Each SSI has two pairs of 8x24 FIFOs and hardware support for an external

DMA controller in order to minimize its impact on system performance. The

second pair of FIFOs provides hardware interleaving of a second audio stream,

which reduces CPU overhead in use cases where two timeslots are being used

simultaneously.

The TVE is implemented in conjunction with the Image Processing Unit (IPU)

allowing handheld devices to display captured still images and

video directly on a TV or LCD projector. It supports the following analog video

outputs: composite, S-video, and component video up to HD720p/1080i.

i.MX51A Automotive and Infotainment Applications Processors, Rev. 2

Freescale Semiconductor

9

Preliminary—Subject to Change Without Notice

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