ZHCSMU9A December 2020 – September 2021 TAS2764
PRODUCTION DATA
The TAS2764 supports alignment of limiter and brownout prevention dynamics across devices using the dedicated ICC pin (Section 8.4.2.9.1) or across the TDM output bus. This ensures consistent gain between channels during limiting or brownout events since these dynamics are dependent on audio content, which can vary across channels. Each device can be configured to align to a specified number of other devices, which allows creation of groupings of devices that align only to each other.
Limiter and brownout activity is optionally transmitted by each device on SDOUT or ICC pin in an 24-bit time slot. When both limiter and brownout are enabled the 24-bit slot is comprised of 11-bit limiter and 13-bit brownout data. If only the limiter is enabled the data will be only the 12-bit limiter data. Gain reduction should be transmitted in adjacent time slots for all devices that are to be aligned beginning with the first slot that is specified by the ICGA_SLOT[5:0] register bits. The order of the devices is not important as long as they are adjacent. The time slot for limiter gain reduction is configured by the GAIN_SLOT[5:0] register bits and enabled by the GAIN_TX register bit being set high. The ICGA_SEN[7:0] register bits specify which time slots should be listened to for gain alignment. This allows any number of devices between two and eight to be grouped together. At least two of these devices should be enabled for alignment to take place.
To enable the inter-chip limiter alignment the ICLA_EN register bit should be set to high. To enable the inter chip BOP alignment the ICBA_EN register bit should be set to high. All devices should be configured with identical limiter and brownout prevention settings.