ZPODD hardware requirements
Updated: October 19, 2012
This topic describes Zero Power Optical Disk Drive (ZPODD) hardware requirements.
This information applies to the following operating systems:
- Windows 8
- Windows Server 2012
The SATA interface to the ODD must conform to the Zero Power Slimline ODD SATA Specification (SATA30_TPR_C102_V16). This specification modifies the existing SATA slimline connector pin assignment to allow a device to notify the host that it requires Device Attention (DA).
A ZPODD-capable ODD must support the new field in the IDENTIFY_PACKET_DEVICE response data indicating if DA is supported by the device.
IDENTIFY PACKET DEVICE (from SATA30_TPR_C102_V16):
|Word 77||Optional/Mandatory||Fixed/Volatile||Serial ATA additional capabilities|
|O||F||5 Supports host environment detect|
|O||F||4 Supports Device Attention on slimline connected device|
|O||V||3-1 Coded value indicating current negotiated Serial ATA signal speed|
|O||F||0 Shall be cleared to 0|
Bit 4, when set to 1, indicates that the device supports Device Attention capability in the slim-line connector. Devices that do not support Device Attention on their slimline connector shall set this bit to 0.
The host platform must connect the ODD device’s DA signal to a general purpose I/O pin. For PC form factors, this is one of the GPEx_STS bits in the ACPI Fixed Hardware register interface (Section 4.7.4 of the ACPI Specification). For system-on-a-chip (SOC)-based form factors, this is any GPIO pin, as long as that pin is exposed by a GPIO driver. In addition, the DA signal and the device electronics must be powered from separate power resources, with the resource for the device electronics controllable by firmware.