SD6XA-064G-000000 SanDisk, SD6XA-064G-000000 Datasheet - Page 62

• Manufacturer Part Number: SD6XA-064G-000000
• Description: SSD ULTRA320 SCSI 64GB
• Manufacturer: SanDisk
• Series: Ultra320r

Specifications of SD6XA-064G-000000

• Memory Size: 64GB
• Memory Type: FLASH
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FFD35-U3S-64-N-P68-P; FFD35-U3S-64-N-P68-P

Q: What is Termination and TRMPWR?
A: The SCSI bus needs to be terminated. This means that both ends of the bus must have a
Q: What kinds of SCSI connectors are available?
A: There are many different connectors for SCSI. Some of them were defined with SCSI-1 and
Q: What type of cables should be used, and how long should they be?
A: SE mode: The maximum cumulative cable length when using a single-ended transceiver
Q: What signal levels does SCSI generate?
A: Single-ended SCSI signal levels vary from 0V to +5.25V. All signals are active low. True is
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circuit to eliminate signal reflections that would occur from the physical ends of the bus.
The termination circuit requires a power source, which is supplied by a line called
TRMPWR, or Termination Power, on the bus. Typically, the TRMPWR source is the host
adapter. However, multiple devices can supply TRMPWR without causing damage.
The old passive termination (Alternative 1 in the SCSI-2 specification), came with SCSI-1
and consisted of a 220 Ω pull-up and a 330 Ω pull-down resistor on each signal.
Active termination (Alternative 2 in the SCSI-2 specification), consists of a 110 Ω resistor
on each signal pulled up to a 2.85V reference supply.
are now obsolete, like the DB-50 connector. Today, the most common are: the 50-pin
Centronics-type SCSI-1 connector, 50-pin or 68-pin High-Density SCSI-2 connector and
DB-25 connector Apple introduced on their Macintosh computers.
Most new host adapters and external devices use the SCSI-2 HD connectors. Additionally,
the SCA-2 connector provides the SCSI ID, while cable use and termination are not
required.
should be 3 m. Implementations that limit the transfer rate to a maximum of 5MB transfers
per second may extend the cumulative cable length to 6 m. (ANSI SCSI-3 X3T10/855D).
The maximum cumulative signal path between terminators shall be 3.0 m when using up to
foru maximum capacitance (25 pF) devices. The maximum cumulative signal path length
between terminators shall be 1.5 m when using from five to eight maximum capacitance
devices. (ANSI SCSI-3 FAST-20 X3T10/1071D).
LVD mode: The maximum cumulative cable length when using an LVD transceiver must
comply with the limit, which is defined by ANSI SCSI-3 X3T10/855D. The maximum
cumulative signal path between terminators shall be 12 m when using up to four maximum
capacitance (25 pF) devices.
The maximum cumulative signal path length between terminators shall be 12 m when using
from five to eight maximum capacitance devices. (ANSI SCSI-3 FAST-20 X3T10/1071D).
a voltage level between 0V and +0.8 V, and false is a voltage between +2V and +5.25V.
Differential SCSI signals conform to the EIA RS-485 interface.
Product Specification and User Manual
SSD (Formerly FFD) Ultra320 SCSI 3.5"
43-PS-0305-00 Rev. 2.2