Motorola MSC8101 ADS User's Guide Page 301

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Glossary Appendix B-11
MAC
Multiply and accumulate. On the SC140 core, the MAC unit is the
main arithmetic processing unit. It performs all the calculations on
data operands. The MAC unit outputs one 40-bit result in the form of
[Extension:Most Significant Portion:Least Significant Portion]
(EXT:MSP:LSP). The multiplier executes 16-bit x 16-bit fractional or
integer multiplication between two’s complement signed, unsigned, or
mixed operands. The 32-bit product is right-justified and added to the
40-bit contents of one of the 16 data registers.
maskable
interrupt
A hardware interrupt that can be enabled or disabled through
software.
master
The device that owns the address or data bus, the device that initiates
or requests the transaction.
MCC
Multi-channel controller. The two MSC8101 MCCs (MCC1 and
MCC2) each handle up to 128 serial, full-duplex data channels. The
128 channels are divided into four su/jointfilesconvert/467811/bgroups (of 32 channels each).
One or more su/jointfilesconvert/467811/bgroups can be multiplexed through corresponding SIx
time-division multiplexing (TDM) channels. Multiplexed in this way,
the MCCs can support a total of four T1 or E1 lines. MCC1 connects
through SI1, and MCC2 uses SI2. Each channel can be programmed
separately either to perform high-level data link control (HDLC)
formatting/deformatting or to act as a transparent channel. See also SI,
TDM, T1, and E1.
memory
controller
A unit whose main function is to control the external bus memories
and I/O devices. The MSC8101 memory controller is located on the
external PowerPC system bus. It controls a maximum of eight
memory banks shared by a high-performance SDRAM machine, a
general-purpose chip-select machine (GPCM), and two
user-programmable machines (UPMs). It supports a glueless interface
to synchronous DRAM (SDRAM), SRAM, EPROM, Flash memory,
burstable RAM, regular DRAM devices, extended data output DRAM
devices, and other peripherals.
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