TMS320VC5504 datasheet(73/128 Pages) TI

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6.7.1.3 Reset Pin (RESET)

6.7.2

Pin Behaviors at Reset

TMS320VC5504

Fixed-Point Digital Signal Processor

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SPRS609A – JUNE 2009 – REVISED JULY 2009

The VC5504 can receive an external reset signal on the RESET pin. As specified above in

Section 6.7.1.2, Main Power-On Reset, the RESET pin is combined with the internal POWERGOOD

signal, that is generated by the MAIN POR, via an AND-gate. The output of the AND gate provides the

hardware reset to the chip. The RESET pin may be tied high and the MAIN POR will provide the hardware

reset, or the RESET pin may be externally generated.

Once the internal hardware reset, from the MAIN POR and the RESET pin, goes high, the DSP clock

generator is enabled and the DSP starts the boot sequence. For more information on the boot sequence,

see Section 4.4, Boot Sequence.

During normal operation, pins are controlled by the respective peripheral selected in the External Bus

Selection Register (EBSR) register. During power-on reset and reset, the behavior of the output pins

changes and is categorized as follows:

• High Group: EM_CS4, EM_CS5, EM_CS2, EM_CS3, EM_DQM0, EM_DQM1, EM_OE, EM_WE,

SPI_CS3, RSV15, RSV14, XF

• Low Group: SPI_CLK, EM_R/W, MMC0_CLK/I2S0_CLK/GP[0], MMC1_CLK/I2S1_CLK/GP[6], RSV12

• Z Group: EM_D[15:0], EMU[1:0], SCL, SDA, SPI_RX, SPI_TX, I2S2_RX/GP[20]/SPI_RX,

I2S2_DX/GP[27]/SPI_TX,

I2S2_RTS/GP[28]/I2S3_CLK,

I2S2_CTS/GP[29]/I2S3_RS,

I2S2_RXD/GP[30]/I2S3_RX, I2S2_TXD/GP[31]/I2S3_DX, GP[12], GP[13], GP[14], GP[15], GP[16],

GP[17],

I2S2_CLK/GP[18]/SPI_CLK,/I2S2_FS/GP[19]/SPI_CS0,

RTC_CLKOUT,

MMC0_CMD/I2S0_FS/GP[1],

MMC0_D0/I2S0_DX/GP[2],

MMC0_D1/I2S0_RX/GP[3],

MMC0_D2/GP[4],

MMC0_D3/GP[5],

MMC1_CMD/I2S1_FS/GP[7],

MMC1_D0/I2S1_DX/GP[8],MMC1_D1/I2S1_RX/GP[9],MMC1_D2/GP[10],

MMC1_D3/GP[11],

TDO,

WAKEUP

• CLKOUT Group: CLKOUT, SPI_CS1

• SYNCH 0→1 Group: SPI_CS0, SPI_CS2, RSV13

• SYNCH 1→0 Group: RSV10, RSV11

• SYNCH X→1 Group: EM_BA[1:0]

• SYNCH X→0 Group: EM_A[20:0]

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