31 lines
1.6 KiB
Markdown
31 lines
1.6 KiB
Markdown
## eMMC
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Helios64 use the Samsung KLMAG1JETD-B041 chip, this storage has features:
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- embedded MultiMediaCard Ver. 5.1 compatible.
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- SAMSUNG eMMC supports features of eMMC5.1 which are defined in JEDEC Standard.
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- Major Supported Features : HS400, Field Firmware Update, Cache, Command Queuing, Enhanced Strobe Mode, Secure Write Protection, Partition types.
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- Non-supported Features : Large Sector Size (4KB).
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- Backward compatibility with previous MultiMediaCard system specification (1bit data bus, multi-eMMC systems).
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- Data bus width : 1bit (Default), 4bit and 8bit.
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- MMC I/F Clock Frequency : 0 ~ 200MHz
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- MMC I/F Boot Frequency : 0 ~ 52MHz
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SAMSUNG eMMC adopts Enhanced User Data Area as Single-Level Cell (SLC) Mode.
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Therefore when master adopts some portion as enhanced user data area in User Data Area, that area occupies double size of original set up size. (ex> if master set 1MB for enhanced mode, total 2MB user data area is needed to generate 1MB enhanced area).
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The eMMC chip installed in Helios64 support the HS400 MODE, with following features:
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- eMMC 5.1 product supports high speed DDR interface timing mode up to 400MB/s at 200MHz with 1.8V I/O supply.
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- HS400 mode supports the following features:
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- DDR Data sampling method
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- CLK frequency up to 200MHz DDR (up to 400Mbps)
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- Only 8-bits bus width available
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- Signaling levels of 1.8V
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- Six selectable Drive Strength (refer to the table below)
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Following table describe the I/O Driver Strength Types
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Support of Driver Type-0 is default for HS200 & HS400 Device
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