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TMPR4938 Datasheet(PDF) 438 Page - Toshiba Semiconductor |
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TMPR4938 Datasheet(HTML) 438 Page - Toshiba Semiconductor |
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438 / 716 page  Chapter 14 AC-link Controller 14-14 14.3.6.7 Slot Activation Control In case ACLC is required to begin transmission or reception of multiple streams at the same time, slot activation control will be useful. To use this feature, the software must deactivate the relevant streams first, enable ACLC Control Enable Register (ACCTLEN), make sure the transmission FIFO becomes full by checking ACLC FIFO Status Register (ACFIFOSTS)’s Full (xxxxFULL) bit, and finally enable ACLC Slot Enable Register (ACSLTEN). This procedure assures that all the reception streams are activated at a frame and all the transmission streams begin to respond to the slot-request bits of that frame. Note that access to ACSLTEN and ACLC Slot Disable Register (ACSLTDIS) needs special care to synchronize with the link-side. Refer to the register description for detail. Since operating ACCTLEN register and DMAC without touching ACSLTEN is sufficient for most usages, the initial ACSLTEN value enables all the transmission and reception through the slots by default. 14.3.6.8 Variable Rate Limitation To improve compatibility with existing AC’97 CODECs and controllers on the market, ACLC combines sample-data for the slots 3 and 4 into one DMA channel, and similarly for the slots 7 and 8. This feature effectively considers that the slot request bit from the CODEC for slot 4 shall be always same (in tandem) as for slot 3 for each frame, and similarly for the slots 7 and 8. ACLC also considers that the slot valid bit from the CODEC for slot 4 shall be always same (in tandem) as for slot 3 for each frame. 14.3.7 GPIO Operation ACLC supports the slot 12 for the MC’97 (Modem Codec) GPIO. The slot 12 is shadowed in the ACLC GPI Data Register (ACGPIDAT) and ACLC GPO Data Register (ACGPODAT) in the following way: • ACLC copies the slot 12 input data into the ACGPIDAT register, if the slot 12 input is marked by the CODEC as valid in the AC-link frame period. • ACLC generates the slot 12 output data from the ACGPODAT register and mark it as valid, if the slot 12 is required from the CODEC in the previous AC-link frame. This shadowing function is enabled as long as ACSLTEN allows. The bit 0 of the slot 12 is defined as ‘GPIO_INT’ and can cause ACLC to request an interrupt. |
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