SimpleTech Zeus Ultra Manuel D’Utilisation

Functional Description

Operating Modes

20

 Zeus Ultra DMA Solid State Drives

The Zeus SSD is configured as a high-performance I/O device, supporting the following 
operating modes:

Primary drive address at system ATA I/O address 1F0h - 1F7h and 3F6h - 3F7h. The 
host must provide chip-enable #CS0 and #CS1. The SSD decodes addresses DA0 
- DA2.

Secondary drive address at system ATA I/O address 170h - 177h and 376h - 377h. 
The host must provide chip-enable #CS0 and #CS1. The SSD decodes addresses 
DA0 - DA2.

Primary and secondary drive addressing modes allow hosts to use the ATA-standard’s 
reserved disk drive I/O addresses. This provides computer system designers with the 
simplest way to accommodate ATA-protocol devices.

Zeus SSDs, on a command by command basis, can operate in either CHS or LBA 
addressing modes. Identify Drive Information (see “Identify Drive Information” on 
page 23) tells the host whether the drive supports LBA mode. The host selects LBA 
mode via the Drive/Head register. Sector Number, Cylinder Low, Cylinder High, and 
Drive/Head register bits HS3=0 contain the zero-based LBA. The drive's sectors are 
linearly mapped with: LBA = 0 => Cylinder 0, head 0, sector 1. Regardless of the 
translation mode, a sector LBA address does not change. LBA = (Cylinder * no of heads 
+ Head) * (sectors/track) + (Sector - 1). Table 6 on page 21 lists the supported IDE 
addressing modes.