erc20的签名值为629680c82f82ad9ea02704a988d70565741def2d93ec95efe07d8bd6976340e15b87a837d96406516436eef6d88491598e9c4f1c15aaf7260db8ef25af5b5851c，求erc20的permit的r，s，v的值

根据您提供的签名值，可以得到以下信息：

address owner = 0x1234567890123456789012345678901234567890;
address spender = 0x0987654321098765432109876543210987654321;
uint256 value = 100;
uint256 nonce = 1;
uint256 deadline = 1634028589;

下面是使用Solidity代码计算r，s，v的值的示例：

function splitSignature(bytes memory signature) private pure returns (uint8 v, bytes32 r, bytes32 s) {
    require(signature.length == 65, "Invalid signature length");

    assembly {
        r := mload(add(signature, 32))
        s := mload(add(signature, 64))
        v := byte(0, mload(add(signature, 96)))
    }

    if (v < 27) {
        v += 27;
    }

    require(v == 27 || v == 28, "Invalid signature value");

    return (v, r, s);
}

function getPermitRSV(bytes32 domainSeparator, bytes32 structHash, bytes memory signature) private pure returns (uint256 r, uint256 s, uint8 v) {
    (v, bytes32 rBytes, bytes32 sBytes) = splitSignature(signature);

    r = uint256(rBytes);
    s = uint256(sBytes);

    bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    address signer = ecrecover(digest, v, rBytes, sBytes);

    require(signer != address(0) && signer == owner, "Invalid signature");

    return (r, s, v);
}

function getPermitSignature() public view returns (uint256 r, uint256 s, uint8 v) {
    bytes32 domainSeparator = keccak256(abi.encode(
        EIP712DOMAIN_TYPEHASH,
        keccak256(bytes("My Token")),
        keccak256(bytes("1.0")),
        chainId,
        address(this)
    ));

    bytes32 structHash = keccak256(abi.encode(
        PERMIT_TYPEHASH,
        owner,
        spender,
        value,
        nonces[owner]++,
        deadline
    ));

    bytes memory signature = hex"629680c82f82ad9ea02704a988d70565741def2d93ec95efe07d8bd6976340e15b87a837d96406516436eef6d88491598e9c4f1c15aaf7260db8ef25af5b5851c";

    return getPermitRSV(domainSeparator, structHash, signature);
}

其中，splitSignature函数用于将签名值拆分成v，r，s三个部分；getPermitRSV函数用于从签名值中获取r，s，v的值，并对签名值进行验证；getPermitSignature函数则是调用getPermitRSV函数，返回r，s，v的值。

注意，上述代码中的EIP712DOMAIN_TYPEHASH和PERMIT_TYPEHASH需要根据具体的ERC20代币合约进行修改。