camisp-253
OFF
ON
ULP
Reset
PwrCmdON
PwrCmdOFF
PwrCmdON
PwrCmdULP
This transition can be
automatic if bit field
CSI2_COMPLEXIO_CFG1[24]
PWR_AUTO
is set to 1.
Public Version
Camera ISP Functional Description
www.ti.com
The CSIPHYs have three power modes: on, off, and ULP (ultra-low power). These modes can reflect the
ON or ULP power state of the three differential lines if the
[24] PWR_AUTO bit
is set to 1. If the PWR_AUTO bit is at reset value (0), the PHY power state is controlled by the
[28:27] PWR_CMD bit field, which directly defines the power state.
shows the PHY power finite state machine (FSM).
Figure 6-73. Camera ISP CSIPHY Power FSM
Another register,
, is used to control the power state of the CSIPHY module with regards to
the differential line state. This register is used to control the mode of the CSIPHY (RxMode or NoRxMode)
and the delay between all the differential lines on STOP state and CSIPHY on NoRxMode. The
[15] FORCE_RX_MODE_IO1 bit field sets the CSIPHY in RxMode or in NoRxMode
(stopped mode). The FORCE_RX_MODE_IO1 bit is automatically reset to 0 by hardware when the
counter ends and the FSM returns to NoRxMode. Three bit fields (
[14]
STOP_STATE_X16_IO1,
[13] STOP_STATE_X4_IO1, and
[12:0]
STOP_STATE_COUNTER_IO1) configure the delay between line stop mode and CSIPHY stop mode.
The delay represents the number of functional clock (CAM_FCLK) cycles and can be calculated as
follows:
Total delay in CAM_FCLK cycle =
.STOP_STATE_COUNTER_IO1 x (1 +
.STOP_STATE_X16_IO1 x15) x (1 +
.STOP_STATE_X4_IO1 x 3).
lists the possible values of the delay, in terms of the CAM_FCLK cycles, depending on the
values of the STOP_STATE_X16_IO1 and STOP_STATE_X4_IO1 bits.
Table 6-33. Camera ISP CSI2 Possible Time-Out Value for RxMode Counter
STOP_STATE_X16_IO1
STOP_STATE_X4_IO1
Possible Delay Value (In Functional Clock Cycles)
0x0
0x0
8191 (with step of 1)
0x0
0x1
32764 (with step of 4)
0x1
0x0
131056 (with step of 16)
0x1
0x1
524224 (with step of 64)
1186
Camera Image Signal Processor
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
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