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CS61884-IQZ Datasheet(PDF) 44 Page - Cirrus Logic |
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CS61884-IQZ Datasheet(HTML) 44 Page - Cirrus Logic |
44 / 71 page CS61884 44 DS485F1 channel or channels. To enable the AWG function for a specific channel or channels the correspond- ing bit(s) in the AWG Enable Register (19h) (See Section 14.26 on page 40) must be set to “1”. When the corresponding bit(s) in the AWG Enable Regis- ter are set to “0” pre-programmed pulse shapes are selected for transmission. In order to access and write data for a customized pulse shape to a specific channel or channels, the following steps are required. First the desired chan- nel and phase sample addresses must be written to the AWG Phase Data Register (18h) (See Section 14.25 on page 40). Once the channel and phase sample address have been selected, the actual phase sample data may be entered into the AWG Phase Data Register at the selected phase sample address selected by the lower five bits of the AWG Phase Address Register (17h) (See Section 14.24 on page 40)). To change the phase sample address of the selected channel the user may use either of the following steps. First, the user can re-write the phase sample address to the AWG Phase Address Register or set the Auto-Increment bit (Bit 7) in the Global Con- trol Register (0Fh) (See Section 14.16 on page 38)) to “1”. When this bit is set to “1” only the first phase sample address (00000 binary) needs to be written to the AWG Phase Address Register (17h) (See Section 14.24 on page 40), and each subsequent access (read or write) to the AWG Phase Data Register (18h) (See Section 14.25 on page 40) will automatically increment the phase sample address. The channel address, however, re- mains unaffected by the Auto-Increment mode. Since the number of phase samples forming the customized pulse shape varies with the mode of op- eration (E1/T1/J1), the AWG Phase Address Reg- ister (17h) (See Section 14.24 on page 40) needs to be re-written in order to re-start the phase sample address sequence from zero. The AWG Broadcast function allows the same data to be written to different channels simultaneously. This is done with the use of the AWG Broadcast Register (16h) (See Section 14.23 on page 40)), each bit in the AWG Broadcast Register corre- sponds to a different channel (bit 0 is channel 0, and bit 3 is channel 3 & etc.). To write the same pulse shaping data to multiple channels, simple set the corresponding bit to “1” in the AWG Broadcast Register (16h) (See Section 14.23 on page 40). This function only requires that one of the eight channel addresses be written to the AWG Phase Address Register (17h) (See Section 14.24 on page 40). During an AWG read sequence, the bits in the AWG Broadcast Register are ig- nored. During an AWG write sequence, the select- ed channel or channels are specified by both the channel address specified by the upper bits of the AWG Phase Address Register (17h) (See Section 14.24 on page 40) and the selected channel or chan- nels in the AWG Broadcast Register (16h) (See Section 14.23 on page 40). During a multiple channel write the first channel that is written to, is the channel that was address by the AWG Phase Address Register. This channel’s bit in the AWG Broadcast Register can be set to ei- ther “1” or “0”. For a more descriptive explanation of how to use the AWG refer to the “How To Use The CS61880/CS61884 Arbitrary Waveform Gen- erator” application note AN204. |
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