BT818Q-R datasheet(14/59 Pages) BRIDGETEK

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BT817/8 Advanced Embedded Video Engine Datasheet

Version 1.1

Document No.: BRT_000302 Clearance No.: BRT#154

4.1.4

Host Memory Write

For SPI memory write transactions, the host sends a ‘1’ bit and ‘0’ bit, followed by the 22-bit address.

This is followed by the write data.

Byte n

Table 4-3 Host Memory Write Transaction

4.1.5

Host Command

When sending a command, the host transmits a 3 byte command. Table 4-5 lists all the host

command functions.

For SPI command transactions, the host sends a ‘0’ bit and ‘1’ bit, followed by the 6-bit command

code. The 2nd byte can be either 00h, or the parameter of that command. The 3rd byte is fixed at 00h.

All SPI commands except the system reset can only be executed when the SPI is in the Single channel

mode. They will be ignored when the SPI is in either Dual or Quad channel mode.

Some commands are used to configure the device and these configurations will be reset upon

receiving the SPI PWRDOWN command, except those that configure the pin state during power down.

These commands will be sticky unless reconfigured or power-on-reset (POR) occurs.

1st Byte

2nd Byte

3rd Byte

Table 4-4 Host Command Transaction

1st Byte

2nd byte

3rd byte

Command

Description

Power Modes

00000000b

00h

ACTIVE

Switch from Standby/Sleep/PWRDOWN

modes to active mode. Dummy memory

read from address 0(read twice)

generates ACTIVE command.

01000001b

00000000b

41h

STANDBY

Put BT817/8 core to standby mode.

Clock gate off, PLL and Oscillator remain

on. ACTIVE command to wake up.

01000010b

00000000b

42h

SLEEP

Put BT817/8 core to sleep mode. Clock

gate off, PLL and Oscillator off. ACTIVE

command to wake up.

Address [21:16]

Address [15:8]

Address [7:0]

Byte 0

Command [5:0]

Parameter for the command

Write Data

Write

Address

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