SpinPoint Barracuda Series, Руководство по эксплуатации продукта

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Barracuda Product Manual Rev04
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5.2 Drive Electronics
Barracuda drive attain their intelligence and performance through the specialized electronic components
mounted on the PCBA. The components are mounted on one side of the PCBA.
The Preamplifier IC is the only electrical component that is mounted on the flexible circuit inside the HDA.
Move the Preamplifier close to the read/write transducer allows higher electrical output of electronics.
5.2.1 Digital Signal Process and Interface Controller
The processor used in the Barracuda is a 16-bit digital signal processor (DSP), with a bus controller unit
(BCU), an interrupt controller unit (ICU), a general purpose timer (GPT), and SRAM.
5.2.2 Disk Controller
The Disk Controller works in conjunction with the DSP to perform the ATA interface control, buffer data
flow management, disk format/read/write control, and error correction. The DSP communicates with the
Disk Controller module by reading from and writing to its various internal registers.
To the DSP, the registers of the Disk Controller appear as unique memory or I/O locations that are randomly
accessed and operated upon. By reading from and writing to the registers, the DSP initiates operations and
examines the status of the different functional blocks. Once an operation is started, successful completion or
an error condition may cause the Disk Controller to interrupt the DSP, which then examines the status
registers and determines an appropriate course of action. The DSP may also poll the device to ascertain
successful completion or error conditions.
The following illustrates a block diagram of DSP and Disk Controller. In the diagram (see Figure 5-2) it
illustrates between the various blocks within the Disk Controller. These blocks will be referred to throughout
this document
.