Table of Contents
- 1 What is difference between on-chip and off chip?
- 2 Why are there both on-chip and off chip caches?
- 3 What is off chip memory bandwidth?
- 4 What are the major advantages of having on-chip memory?
- 5 What is meant by on-chip memory?
- 6 What are the two key parameters to be considered with respect to the on-chip memories?
- 7 What are the types of on-chip and off-chip memory?
- 8 What is the difference between off chip memory and DRAM?
What is difference between on-chip and off chip?
On-chip components are the components built on the chip (IC) itself i.e on the same silicon substrate like transistors ,resistors ,capacitors ,coils…etc . Off-chip components are discrete components that are not built on the chip .
Why are there both on-chip and off chip caches?
Both the cache and Scratch-Pad SRAM allow fast access to their residing data, whereas an access to off-chip memory (usually DRAM) requires relatively longer access times.
What is an on-chip cache?
The on-chip cache is unified instruction and data, 4-way set associative architecture that supports write-through policy. Each block of cache memory consists of 16 bytes. The sizes of on-chip cache memory are 8K and 16K bytes.
What is off chip memory bandwidth?
Off-chip bandwidth is gener- ated by the on-chip cache hierarchy (cache misses and cache writebacks). The traffic from the chip to the memory is due to the writes which are sent from the last level on-chip cache to the memory, or to the following level external cache, whenever a block is replaced from the cache.
What are the major advantages of having on-chip memory?
Another advantage of on-chip memory is that it requires no additional board space or circuit-board wiring because it is implemented on the FPGA directly. Using on-chip memory can often save development time and cost.
What advantage might on-chip memory have for program execution?
What is meant by on-chip memory?
The on-chip SRAM, termed Scratch-Pad memory, refers to data memory residing on-chip, that is mapped into an address space disjoint from the off-chip memory, but connected to the same address and data buses.
What are the two key parameters to be considered with respect to the on-chip memories?
Speed and size are the two key parameters to be considered with respect to the on-chip memories.
What is the difference between on-chip and off-chip components?
On-chip components are the components built on the chip (IC) itself i.e on the same silicon substrate like transistors ,resistors ,capacitors ,coils…etc . Off-chip components are discrete components that are not built on the chip .
What are the types of on-chip and off-chip memory?
The types of on-chip memory commonly integrated with the processor on the same chip are instruction cache, data cache, and on-chip SRAM. The instruction and data cache are fast local memory serving an interface between the processor and the off-chip memory.
What is the difference between off chip memory and DRAM?
Whereas, off chip memory has much more latency (5–15 cycles). DRAM is the preferred off chip memory technology which uses an altogether different process technology. The basic cell uses a capacitor with a pass transistor to store a bit. It is much cheaper than SRAM.
What happens if the on-chip memory is bad?
If the on-chip memory is sufficiently defective the entire chip (CPU) is scrap. If the off-chip memory is bad it might be able to be replaced. If a system has both on and off chip memory the on chip is typically used to cache the off-chip. What is the difference between cache memory and primary memory? Where are these both stored.