External Delay with ADAU1466

I have connected IS62WVS5128GBLL - 4MBit SRAM to ADAU1466. It used for block ExtDelay. Slave is 5, SPI Mode 3. It works well (only) with 13,5MHz. RAM size 524288 bytes.

I have connected ExtDelay to channel 0 and channel 1. It works well, in both chgannels I can use delay with more than 2 sec.

My question is - is possible to use more memories for other channels?

How maximum number of ExtDelay can be used in SigmaStudio 4.5 ? Which is principle of memory sharing/settings between ExtDelay blocks?