Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 2/14/2023
Public

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16.5.9.2.3. Reset and Card Device Discovery Overview

Before starting any CE‑ATA operations, the host must perform a MMC reset and initialization procedure. The host and card device must negotiate the MMC transfer (MMC TRAN) state before the card enters the MMC TRAN state.

The host must follow the existing MMC discovery procedure to negotiate the MMC TRAN state. After completing normal MMC reset and initialization procedures, the host must query the initial ATA task file values using the RW_REG or CMD39 command.

By default, the MMC block size is 512 bytes—indicated by bits 1:0 of the srcControl register inside the CE‑ATA card device. The host can negotiate the use of a 1 KB or 4 KB MMC block sizes. The card indicates MMC block sizes that it can support through the srcCapabilities register in the MMC; the host reads this register to negotiate the MMC block size. Negotiation is complete when the host controller writes the MMC block size into the srcControl register bits 1:0 of the card.