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WM8281ECS/R Scheda tecnica(PDF) 171 Page - Cirrus Logic |
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WM8281ECS/R Scheda tecnica(HTML) 171 Page - Cirrus Logic |
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171 / 392 page  WM8281 Rev 4.0 171 SLIMBUS INTERFACE CONTROL The WM8281 features a MIPI-compliant SLIMbus interface, providing 8 channels of audio input and 8 channels of audio output. Mixed audio sample rates are supported on the SLIMbus interface. The SLIMbus interface also supports read/write access to the WM8281 control registers. The SLIMbus interface on WM8281 comprises a Generic Device, Framer Device, and Interface Device. A maximum of 16 Ports can be configured, providing up to 8 input (RX) channels and up to 8 output (TX) channels. The audio paths asso ciated with the SLIMbus interface are described in the “Digital Core” section. The SLIMbus interface supports read/write access to the WM8281 control registers, as described later in this section. The SLIMbus clocking rate and channel allocations are controlled by the Manager Device. The Message Channel and Data Channel bandwidth may be dynamically adjusted according to the application requirements. Note that the Manager Device functions are not implemented on the WM8281, and these bandwidth allocation requirements are outside the scope of this datasheet. SLIMBUS DEVICE PARAMETERS The SLIMbus interface on the WM8281 comprises three Devices. The Enumeration Address of each Device within the SLIMbus interface is derived from the parameters noted in Table 49. DESCRIPTION MANUFACTURER ID PRODUCT CODE DEVICE ID INSTANCE VALUE ENUMERATION ADDRESS Generic 0x012F 0x5110 0x00 0x00 012F_5110_0000 Framer 0x012F 0x5110 0x55 0x00 012F_5110_5500 Interface 0x012F 0x5110 0x7F 0x00 012F_5110_7F00 Table 49 SLIMbus Device Parameters SLIMBUS MESSAGE SUPPORT The SLIMbus interface on the WM8281 supports bus messages as noted in Table 50. Additional notes regarding SLIMbus message support are noted below, and also in Table 51. MESSAGE CODE MC[6:0] DESCRIPTION GENERIC FRAMER INTERFACE Device Management Messages 0x01 REPORT_PRESENT (DC, DCV) S S S 0x02 ASSIGN_LOGICAL_ADDRESS (LA) D D D 0x04 RESET_DEVICE () D D D 0x08 CHANGE_LOGICAL_ADDRESS (LA) D D D 0x09 CHANGE_ARBITRATION_PRIORITY (AP) 0x0C REQUEST_SELF_ANNOUNCEMENT () D D D 0x0F REPORT_ABSENT () Data Channel Management Messages 0x10 CONNECT_SOURCE (PN, CN) D 0x11 CONNECT_SINK (PN, CN) D 0x14 DISCONNECT_PORT (PN) D 0x18 CHANGE_CONTENT (CN, FL, PR, AF, DT, CL, DL) D Information Management Messages 0x20 REQUEST_INFORMATION (TID, EC) D D D 0x21 REQUEST_CLEAR_INFORMATION (TID, EC, CM) D D D 0x24 REPLY_INFORMATION (TID, IS) S S S 0x28 CLEAR_INFORMATION (EC, CM) D D D 0x29 REPORT_INFORMATION (EC, IS) S |
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